Andy Murray had to come from a set down to beat Pablo Andujar 3-6 6-1 6-2 in the first round of the Acapulco International.
Croatia’s own Marin Cilic won the Zagreb Indoors tournament with a 6-3 6-4 final victory over top seed Tommy Haas.
Andy Murray slipped out of the top four while Stan Wawrinka is the new world number three as the new rankings were released.
Milos Raonic’s win over compatriot Vasek Pospisil in the Rogers Cup guaranteed elevation inside the world top ten.
No one knows better than Argentina's Juan Martin Del Potro how difficult it is to win a Grand Slam title in the era of the "Big Four".
World number six Tomas Berdych will play the traditional Wimbledon warm-up event at Queen's Club in June.
Former world number three Ivan Ljubicic retired from professional tennis with a whimper after he lost 6-0 6-3 to Ivan Dodig in Monte Carlo.
Former world number three Ivan Ljubicic retired from professional tennis with a whimper after he lost 6-0 6-3 to Ivan Dodig in the first ro
First round: Viktor Troicki (Serbia) beat Jean-Rene Lisnard (Monaco) 6-3 6-1; Ivan Dodig (Croatia) beat Ivan Ljubicic (Croatia) 6-0 6-3
World number one Novak Djokovic was given a stern second-round test by Sergiy Stakhovsky before winning 7-6(5) 6-3 in Dubai.
World number four Andy Murray endured a shaky start at ATP Dubai, coming through his first-round match against Michael Berrer 6-3 4-6 6-4.
First round: 4-Jo-Wilfried Tsonga (France) beat Marcos Baghdatis (Cyprus) 7-6(2) 6-4
Jo-Wilfried Tsonga sealed the 200th match win of his career in beating Edouard Roger-Vasselin 6-4 7-5 to reach the ATP Marseille semi-finals
Quarter-final: 3-Janko Tipsarevic (Serbia) beat 7-Ivan Ljubicic (Croatia) 6-4 6-4
Top seed Jo-Wilfried Tsonga beat Nicolas Mahut 6-3 6-2 to progress through to the quarter-finals of the Marseille Open.
ATP World Tour Finals
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