For Novak Djokovic to play his best tennis against the very best in this era is a truly astonishing feat, believes Sky Sports tennis expert Barry Cowan. Djokovic joined the tennis greats when he downed Andy Murray 3-6 6-1 6-2 6-4 on Sunday to claim his maiden French Open title and hold all four Grand Slams at the same time.The world No 1 recovered from a nervous start to impose his pace on Court Philippe Chatrier and clinch the title he craved after three previous failures in a Roland Garros final. He became only the third man after Don Budge and Rod Laver to hold the four majors at the same time, and the eighth man to triumph at Wimbledon and the French, US and Australian Opens.Djokovic, who is now on a 28-match winning streak in majors, moved level alongside Roy Emerson with his 12th Grand Slam crown and is now just two behind Pete Sampras and Rafa Nadal and five behind Swiss great Roger Federer. Djokovic wins French Open Novak Djokovic beats Andy Murray to win French Open for first time And Cowan says the Serbians achievements have not come easy since beating Jo-Wilfried Tsonga to lift his first major title in Australia eight years ago.Djokovic joins an elite group now, he told Sky Sports. To think that its 12 majors hes won now while Federer has won 17 with Nadal 14 and Sampras 14 - hes joint fourth on the list. Apart from the first one which was against Tsonga in 2008, his last 11 wins, hes had to beat Nadal, Federer and Murray in the final in each of those last 11.So its not as if the draw has opened up. To play his best tennis against the very best in this era is truly astonishing.Djokovic is the model of consistency. The last time he failed to make at least the quarter-finals of the majors was when he slipped to a third-round loss at the 2009 French Open. He became the first player to break through the $100m barrier in prize money this year and has now hammered home his right to be regarded as the greatest player of all time following his victory in Paris.I think if he does win Wimbledon, then it would arguably be his biggest effort of any, added Cowan. Barry Cowan gives his assessment after Novak Djokovic clinched a career Grand Slam in Paris Now hes achieved what hes wanted to achieve. You would have thought if hes human, you would think he would have a bit of a let down.Djokovic has surprised so many of us in the last couple of years. At 29, and when he started 2016, the question was can he achieve what he did last year?Most of us in the game felt yes, because there is still room for improvement. I still feel there are areas of his game that Novak can get better and right now in big matches, he just knows hes going to win. 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Kuznetsov, who was selected by the Capitals in the first round of the 2010 NHL Entry Draft, has been playing for his hometown team Chelyabinsk Traktor of the KHL.Stuart Broad is set to return to the England one-day team for the fourth ODI with South Africa in Johannesburg on Friday. Trevor Bayliss side won the first two matches in the five-match series before the Proteas secured a seven-wicket victory in the third clash on Tuesday.Broad has not played for his country in the one-day format since their disappointing World Cup performance last year and in-form batsman Joe Root feels the experienced fast bowler will offer a boost to the squad. I am sure he will be desperate to come out there and play, especially after the way he performed out here last time, said Root.Stuart has played over 100 one-dayers for England and has huge amounts of experience. If he comes in, that knowledge is just one of the things he will bring. Nick Knight joins James Cole as they preview the fourth ODI between South Africa and England Its very exciting and everyone who is not playing at the minute is pushing hard for places and that is exactly where you want to be in a squad of players.Despite losingg Tuesdays game, Yorkshire batsman Root insists England remain confident in their abilities and will be looking to seal a series victory at the first opportunity, at the same venue in which they secured their Test series victory.dddddddddddd. Joe Root with Stuart Broad at Thursdays nets session at Bidvest Stadium We have played some fantastic cricket for six months now in this format of the game, he told Sky Sports News HQ.In that respect, we have got a lot of momentum and it is about making sure we keep building on everything we are doing and keep learning from our experiences.We must learn from the loss the other night and make sure that something like that doesnt happen again. Englands Joe Root is in confident mood ahead of the fourth ODI with South Africa Root scored a century in the first innings of the Test victory over South Africa in January and he expects another high scoring contest in the ODI encounter.With the thin air, the ball flies further on the highveld and with good wickets and fast outfields, youre going to get big scores, he added.So if you get in, youve got to make sure you make the most of it.Weve got some very hungry guys in our squad who are keen to make some big scores and put South Africa under pressure if we bat first.Watch the fourth ODI between South Africa and England live on Sky Sports 2 HD from 11am on Friday. Also See: Cook warns of burnout Untried Dawson in T20 squad England can win World T20 England fixtures ' ' '