Great Britain's Laura Robson lost 6-2 6-2 to world number one Serena Williams in the second round of the Italian Open.
British number one Robson, who beat Williams' sister Venus in round one, broke serve in the opening game.
But Williams, 31, won six of the next seven games to take the opening set.
Robson, 19, could not convert two break points in the fifth game of the second set, before Williams broke in the sixth and then again in the eighth to win.
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