Defending champion Stan Wawrinka was upset by Damir Dzumhur 7-6 (4), 6-3 in the first round of the Dubai Tennis Championships
DUBAI, United Arab Emirates (AP) -- Defending champion Stan Wawrinka was upset by Damir Dzumhur 7-6 (4), 6-3 in the first round of the Dubai Tennis Championships on Tuesday....

American Steve Johnson advanced to the second round of the Mexican Open with a surprisingly easy 6-4, 6-4 win over countryman John Isner
MEXICO CITY (AP) -- American Steve Johnson advanced to the second round of the Mexican Open with a surprisingly easy 6-4, 6-4 win over countryman John Isner on Monday night....

Dominic Thiem won the Rio Open on his favorite surface of clay Sunday in a tournament victory which he hopes will jump-start his season after a slow start
RIO DE JANEIRO (AP) -- Dominic Thiem won the Rio Open on his favorite surface of clay Sunday in a tournament victory which he hopes will jump-start his season after a slow start....

Top-seeded Milos Raonic has withdrawn from the Delray Beach Open final because of a hamstring injury, giving the title to Jack Sock. Raonic pulled out Sunday
DELRAY BEACH, Fla. (AP) -- Top-seeded Milos Raonic withdrew from the Delray Beach Open final Sunday after injuring his hamstring a day earlier, giving the title to Jack Sock....

Second-seeded Jo-Wilfried Tsonga won a second title in as many weeks by defeating fellow Frenchman Lucas Pouille 6-4, 6-4 Sunday in the Open 13 final
MARSEILLE, France (AP) -- Second-seeded Jo-Wilfried Tsonga won a second title in as many weeks by defeating fellow Frenchman Lucas Pouille 6-4, 6-4 Sunday in the Open 13 final....

Nursing an aching right shoulder injury, Novak Djokovic set his sight on a return to tennis for the Masters 1000 of Indian Wells
MEXICO CITY (AP) -- Nursing an aching right shoulder injury, Novak Djokovic planned to return to tennis at Indian Wells in the California desert. But the Serbian star changed his mind and accepted a wild card to play in the Acapulco tournament that starts Monday....

Australia will host its Davis Cup quarterfinal against the United States at Pat Rafter Arena in Brisbane from April 7-9
BRISBANE, Australia (AP) -- Australia will host its Davis Cup quarterfinal against the United States at Pat Rafter Arena in Brisbane from April 7-9....

American teen Catherine Bellis captured her first career top 10 win when she upset sixth-ranked Agnieszka Radwanska 6-4, 2-6, 6-2 at the Dubai Tennis Championships on Wednesday
DUBAI, United Arab Emirates (AP) -- American teen Catherine "CiCi" Bellis captured her first career Top 10 win on Wednesday when she upset sixth-ranked Agnieszka Radwanska 6-4, 2-6, 6-2 at the Dubai Tennis Championships....