HOUSTON -- Taijuan Walker left a start early for the third time this season with the same foot problem on Tuesday night against the Houston Astros, leaving the Seattle Mariners searching for how to eliminate the issue.Luis Valbuena hit a solo homer and Colby Rasmus and rookie A.J. Reed added two-run shots in the fourth inning to back up a solid start by Dallas Keuchel and give the Astros a 5-2 victory.Walker (4-7) yielded five hits and five runs before leaving after four innings with discomfort in his right foot. He also left early on June 14 and June 19 because of his foot.Taijuan obviously still isnt quite right, manager Scott Servais said. He struggled, and hes trying to pitch through it, but we probably have to re-evaluate where we are at here. We will have it looked at again.Walker is frustrated that this has lingered for so long.I feel like I just havent had my best stuff, Walker said. My (velocitys) down. My change-up isnt as sharp. Nothing is really as sharp just because I cant get into my legs and get after it. Its probably not best for me to go out there and pitch because I cant give it 100 percent.Keuchel (6-9), last years AL Cy Young Award winner who has struggled this season, allowed five hits and two runs in six innings for his season-high third straight win. Will Harris, who was named to his first All-Star team on Tuesday, pitched a scoreless ninth for his ninth save.The Astros trailed by one in the fourth inning when Rasmus launched his homer off Walker (4-7) to the bullpen in right-center field to make it 3-2. Valbuena drew a walk before, with two outs and two strikes, Reed hit his second career homer to left-center to extend it to 5-2.First two innings, was good. I was able to drive, Walker said. After the second inning, I had no legs. Everything was up. Everything was running back to the plate. I just couldnt drive it in there.Nelson Cruz homered for the Mariners, who dropped their second straight to Houston.The three home runs Walker allowed tied a career-high and all were by left-handers. Hes been plagued by homers by lefties this season and 13 of the 18 homers he has allowed have been to them.Dae-Ho Lee singled with one out in the second before a double by Kyle Seager. The Mariners took a 1-0 lead on an RBI groundout by Chris Iannetta.Valbuenas homer, which landed in the second deck in right field, came with two outs in the bottom of the inning to tie it at 1-all.Cruzs 22nd home run gave Seattle a 2-1 lead in the fourth inning.He was shaken up in the sixth inning when he fouled a ball off his left foot and leg. He limped around the plate for a couple of minutes while talking to Servais and a trainer before staying in the game to finish his at-bat.Hes sore. I expect that he will be in there (Wednesday), Servais said. He is going to be a little bit sore no doubt. He smoked the ball off the top of his foot.HOT IN HEREThe air conditioning in Minute Maid Park was off for about three innings on Tuesday night because of a power outage outside of the building. It had been off for a bit when the teams official Twitter account announced the problem at about 9 p.m. with the temperature outside the ballpark a balmy 86 degrees. Many people could be seen fanning themselves with their hands or pieces of paper as the temperature in the domed ballpark began to rise. Another tweet came in the eighth inning saying the problem was fixed and the air conditioning was back on.TRAINERS ROOMMariners: RHP Felix Hernandez will throw a simulated game Wednesday. Servais said Hernandez will throw 45 pitches. Hernandez has been on the DL with a strained right calf since June 1.UP NEXTMariners: Wade LeBlanc (1-0, 1.50) will make his third start of the season on Wednesday. LeBlanc allowed three hits and two runs in six innings of a 5-2 win over Baltimore in his last start.Astros: Mike Fiers (6-3, 4.12) is scheduled to start for Houston on Wednesday. Fiers has won three straight and has pitched 14 2/3 consecutive scoreless innings at home. Jonathan Isaac Magic Jersey . The 31-year-old Spain midfielder hasnt played since Madrid lost in the Copa del Rey final to Atletico Madrid in May due to back and foot injuries. Nikola Vucevic Magic Jersey . - The Oakland Raiders re-signed offensive lineman Khalif Barnes on Friday. http://www.magicauthentic.com/kids-jonathan-isaac-magic-jersey/ . Sulaiman, 44, was chosen unanimously Tuesday in a vote by the leadership, the World Boxing Council said. Sulaiman becomes the sixth president of the organization. Jerian Grant Jersey . Didier Drogba gave away the penalty that put Senegal one goal away from a major upset, but the veteran striker will get another chance -- probably his last -- at the World Cup after Salomon Kalous injury-time strike sealed the Ivorians place in Brazil next year. Tracy Mcgrady Jersey . The nimble-footed quarterback got his wish, dashing through the snow and a weary defence all the way into the NCAA record book.Matt Brocklebank runs the rule over the Cheltenham Gold Cup, with Don Cossack fancied to justify favouritism. Don Cossack heads the betting for the Timico Cheltenham Gold Cup and has been given the vote of confidence from jockey Bryan Cooper, who prefers the Gordon Elliott-trained nine-year-old over Willie Mullins Don Poli. Racing legend Sir Anthony McCoy tells Sky Sports just what it takes to win the Gold Cup at Cheltenham Will it be the right choice by the jockey, or can Cue Card complete an illustrious treble and bring up the £1million bonus? Heres our A-Z guide to the field for the 3m2f70y Grade 1 contest. CARLINGFORD LOUGH (Jockey: Barry Geraghty)Recent form: 19-461 Carlingford Lough (left) beat Road to Riches to the Irish Gold Cup Dual winner of the Irish Gold Cup at Leopardstown, where he slammed Road To Riches by 12 lengths, but has come up short on two previous visits to the Cheltenham, including when a well-held ninth to Coneygree in this race. This years renewal looks a shade stronger if anything and a place probably his best hope.Rating: 6/10CUE CARD (Paddy Brennan)Recent form: 2-4111 Remarkable campaigner who romped to victory in the Champion Bumper here as a four-year-old and hes had a distinguished hurdling and chasing career since then. Right back to his very best this season and hes bidding to complete a £1m bonus treble having won the Betfair Chase and King George on his last two starts. Won the Ryanair Chase in 2013 on his last Festival visit and surely one of the most popular winners of the week should he prevail.Rating: 9/10DJAKADAM (Ruby Walsh)Recent form: 12-21F Djakadams jockey Ruby Walsh and trainer Willie Mullins in the parade ring after winning in the John Durkan Memorial Punchestown Chase Possibly the forgotten horse of the race having fallen when odds-on favourite here in January but certainly worth remembering it was he who chased home Coneygree in the big one 12 months ago. Looked as good, if not better, than ever when thrashing Valseur Lido in the John Durkan on his seasonal debut and at the age of seven theres every reason to believe he could have much more to offer.Rating: 7/10DON COSSACK (Bryan Cooper)Recent form: 111F1 Ended last season as the highest-rated chaser in training and this years form gives us no reason to doubt his talent. One blip was a late fall when appearing to be mounting a strong challenge in the King George at Kempton and although not particularly impressive in his prep at Thurles in January, that came over an inadequate trip and on ground softer than he cares for. Some have questioned his Cheltenham record but had excuses when he was third in last years Ryanair and hes the one they all have to beat with Cooper opting to ride him over Don Poli.Rating: 10/10DON POLI (Davy Russell)Recent form: 11-511 Bryan Cooper and Willie Mullins (right) with Don Poli Hugely talented seven-year-old who doesnt do anything flashy but gets the job done more often than not, winning five of his six chase starts to date.dddddddddddd Most of his form is on soft going but did win the RSA Chase here on good 12 months ago and hes bound to be staying on strongly up the hill. But will he be quick enough to maintain his place when the tempo increases?Rating: 8/10IRISH CAVALIER (Paul Townend)Recent form: 42155P Irish Cavalier ridden by Paul Townend (left) jumps the last ahead of Annacotty ridden by Ian Popham (right) Won the novices handicap chase at the meeting last year and added to his tally at Newton Abbot in October. Found life tough since, though, and pulled up when last seen on heavy ground here in January. Loads to prove in Grade One company and yet to fully convince over a staying trip so plenty of reasons to look elsewhere.Rating: 2/10OFAOLAINS BOY (Noel Fehily)Recent form: 5/P1P8 Noel Fehily riding OFaolains Boy to win The David Martin Graduation Steeple Chase at Newbury Had a long time off after enjoying a good 2013/14 campaign, when he beat Smad Place narrowly to claim RSA Chase glory at the Festival. Very in-and-out since returning and while his wide-margin win at Newbury in December suggested he was back on an upward trajectory, two flops since, including over hurdles last time, temper enthusiasm. Hard to see him being good enough to contest the finish.Rating: 2/10ON HIS OWN (Patrick Mullins)Recent form: 97U482 Davy Russell on Lord Windermere (R) won from David Casey on On His Own (centre) in the 2014 Gold Cup Grand old servant to the Mullins yard and his finest hour came here when beaten a short-head by Lord Windermere in the 2014 renewal of the Gold Cup. Hes being aimed at the Grand National and looked on good terms with himself when second behind Boston Bob at Fairyhouse recently but hell need others in this line-up to seriously disappoint if hes to lift the top prize here.Rating: 3/10ROAD TO RICHES (TBC)Recent form: 13-312 BJ Cooper on Road To Riches (left), eventual winner Ruby Walsh on Vautour and Richard Johnson on Village Vic clear a jump in the Ryanair Chase Third in the Gold cup last season and has kept up a very strong level of form this term but he ran in the Ryanair Chase on Thursday and doesnt look likely to take part.Rating: 5/10SMAD PLACE (Wayne Hutchinson)Recent form: 4-1141 Popular grey who went close at the Festival in the World Hurdle a couple of times before pushing OFaolains Boy close in the 2014 RSA Chase. Wasnt anything like his best throughout most of the last campaign but returned to action with a Kempton win in November and followed up in the Hennessy Gold Cup at Newbury. Only fourth when different tactics were adopted in the King George at Kempton but back to peak form with a thrilling front-running win over this course and distance in January. Looks a strong pace angle here but drying ground and stronger opposition the slight nagging doubts over his claims.Rating: 7/10VERDICT: Few would rule out Cue Card winning the £1million bonus after the season hes had already and the reception Sprinter Sacre received on Wednesday could even be matched should Colin Tizzards popular chaser do the business in Fridays feature. But Don Cossack looked like he could have taken his measure in the King George before falling two fences from home and the drying ground has come good for Gordon Elliotts highly-regarded charge. Hes the pick of Bryan Cooper and is strongly fancied to open his Cheltenham Festival account at the third time of asking. Also See: Bet now at Cheltenham! Video replay library Full racing results First race of the day offer £10 free bet ' ' '