What Djokovic needs to do to win:
Play deep, cross-court shots to establish an advantage in longer rallies. Djokovic is nine years younger and is one of the fastest men in tennis while the 35-year-old Haas played a marathon five-setter in round three, so the world No. 1 will want to use his movement to create angles in running rallies. Strike first: Djokovic is 28-2 when winning the first set this season; Haas is 2-7 when losing the first set.
What Haas needs to do to win:
Play with variety and urgency. Haas will use his slice backhand to drag Djokovic to net, where he is not as comfortable, and will try to stretch Djokovic wide in rallies. Haas must mix up his serve against Djokovic, who leads the ATP in points won returning second serve (57 percent) but won just 27 percent of points on Haas’ second serve in the German’s sweep in Miami in March.
The Pick: Djokovic in four sets
A resurgent Haas will be pumped up knowing he just swept Djokovic two months ago, but the slower clay court strengthens Djokovic’s advantages in movement and defense. The world No. 1 beat Haas in their lone clay-court meeting at the 2006 French Open. If Djokovic plays with control, he will advance to his third straight semifinal in Paris.
Rafael Nadal vs. Stanislas Wawrinka
Nadal leads head-to-head, 9-0
!What Nadal needs to do to win:
Play cross-court combinations and whip his lefty topspin forehand cross-court into Wawrinka’s one-handed backhand. Nadal has dictated play against Wawrinka in the past by backing the Swiss up behind the baseline on the backhand side to create open space, then driving the ball deep to the opposite corner. The onus is all on Wawrinka to take the risk.
What Wawrinka needs to do to win:
Recover quickly from his five-set marathon win over Richard Gasquet and red line his game from the start. Wawrinka must do everything as well as he can—drive his one-handed backhand down the line, serve with precision and attack the Spaniard’s second serve—and even if he does it all, he still has to hope the reigning champion has an off day to truly threaten.
The Pick: Nadal in three sets
Wawrinka’s rousing comeback from a two-set deficit to defeat Gasquet is a career highlight, but the Swiss may have a better shot of lofting a lob over the Eiffel Tower than beating Nadal, who has won all 19 sets they’ve played. Nadal dropped the opening set in his first two matches, but hasn’t surrendered a set since and should keep that streak going into his eighth Roland Garros semifinal.