Early exit for Watson
Heather Watson saw her Sony Open Tennis challenge ended in the opening round with a straight-sets defeat to French qualifier Virginie Razzano.
The 21-year-old Briton, who was a wild card in Miami, had reached the second round in Indian Wells two weeks ago - including a victory over Razzano during qualifying - but was unable to match that as she fell to a 6-4 6-0 loss in 71 minutes.
Ranked 40 places lower than her opponent at 121 in the world, Watson gained the edge in a nervy opening to take a 3-1 lead, only for Razzano to reel off the next three games.
Watson broke again to level at 4-4 but errors continued to creep into her game and the Frenchwoman scored the decisive break in game nine before holding to see out a topsy-turvy first set in 43 minutes.
The Briton's game then crumbled in the second set, which was wrapped up with very little fuss by Razzano.
Double faults and a poor shot selection failed to help Watson, whose first-serve percentage was just 14 while her only two break-point opportunities were brushed aside before the Frenchwoman clinched the contest on serve and with her first match point.
In the day's other games, Croatian teenager Donna Vekic beat Japan's 43-year-old Kimiko Date-Krumm 7-6 (7-2) 6-2.
The evergreen Asian veteran reaching the Miami final in 1995 - 15 months before her 17-year-old opponent was even born.
China's Peng Shuai defeated Czech Karolina Pliskova 7-5 6-0 while American Vania King 'double-bageled' Spaniard Estrella Cabeza Candela 6-0 6-0.
Swede Rebecca Peterson eliminated Germany's Mona Barthel, who retired with a stomach complaint while trailing, 6-4 4-2.
American Lauren Davis, who reached the fourth round last week in Indian Wells, advanced over China's Zhang Shuai 6-2 6-3.
Russian Nadia Petrova defeated Ursula Radwanska 7-5 1-6 6-4 while American qualifier Coco Vandeweghe beat Marina Erakovic of New Zealand 6-4, 7-6 (8-6) and Christine McHale came through against China's Zheng Jie 6-4 6-2.