SPA-FRANCORCHAMPS, Belgium -- Lewis Hamiltons grid penalty for the Belgian Grand Prix has increased to a whopping 55 places after Mercedes made further engine changes on Saturday.The defending Formula One champion and current championship leader was already condemned to start from the back of the grid after picking up a 15-place grid penalty in Friday mornings first practice and a further 15 spots following another component change in the afternoon.Given this, Mercedes took the opportunity to make multiple power unit changes -- meaning a further and meaningless 25-place drop in a race of 22 cars -- with a view to keeping Hamiltons engine in good shape for the rest of the season.Grid penalties apply only to the race weekend itself and do not carry over into the next race, meaning that Hamiltons engine should be in top condition at the Italian GP in Monza next weekend and beyond that, providing he does not encounter further mechanical problems.Hamilton is joined at the back by McLaren driver Fernando Alonso, whos taking a 35-place hit for engine changes.The 55-place drop equals the record grid penalty handed to Alonso at last years race in Spa, when his Mclaren teammate Jenson Button also picked up a 50-place penalty under the complex system.With nothing to gain on the track, or times from rivals to chase down, Hamilton was free to focus on Sundays race.In Saturdays third and final practice session, he finished fifth but was clearly holding back on speed and his clear priority in the afternoon qualifying session will be to save tires.Spa is an exceptionally fast circuit with more than 70 percent of the race at full throttle and average speeds around 230 kilometers per hour (143 miles per hour). 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SAN DIEGO -- The worst of the National League West is tying a bow on their four-game series.The Arizona Diamondbacks (51-72) face San Diego (52-71) on Sunday with the Padres trying to snap a four-series losing streak.The Padres, who are headed to their sixth straight losing season, took the first two games before the Diamondbacks rallied behind Robbie Rays gem to win Saturday night.San Diego will be looking to get more hits than errors Sunday, something they didnt do on Saturday. The Padres had four errors and three hits.Arizona right-hander Braden Shipley gets the nod and the Diamondbacks are hoping he doesnt repeat his last performance. Shipley, who is making his first career start against the Padres, was rocked for seven runs (six earned) over five innings in losing to the New York Mets on Tuesday.It was stumble for Shipley, who has been pretty solid since his debut. And he was cruising along through the first four innings when trouble arrived in the fifth. Manager Chip Hale stayed with his youngster and he didnt record an out in the sixth.We dont want them to take their lumps to the point where were out of a game, Hale said. I wish I couldve gotten him out of there a little quicker.Before the Diamondbacks get out of town, theyll face righty Luis Perrdomo.dddddddddddd An afterthought at the beginning of the season, Perdomo has become the senior member of the rotation after James Shields, Drew Pomeranz and Andrew Cashner were traded. With opening day starter Tyson Ross limited to one start, Perdomo has been thrust into a more prominent role.Perdomo, who has hit an uneven patch, is making his 14th career start and second against Arizona. He was tagged with his third straight loss in his last outing Monday against the Tampa Bay Rays.Although he didnt pitch that bad, He was charged with three runs and five hits over 5 2/3 innings. His trouble came in the early innings when he was trying to be too fine. He tip-toed out of a first-inning bases loaded jam by allowing one run.Trying to be too perfect, Perdomo said through a translator. That was the biggest issue that I had.Two of Perdomos wins have come against the Diamondbacks, including one in relief. He prevailed in a start on July 4, when pitching six innings of three-run ball.Its the first game for the Diamondbacks in which they officially know shortstop Nick Ahmen is out. Hell undergo season-ending hip surgery next week. ' ' '