Twenty-year-old Margarita Gasparyan, a Russian making her Wimbledon debut, broke serve
at the first opportunity and led 3-1 in the opening set.
The Kiwi broke serve
after Robson put a backhand wide.
Robson's nerves eased in the second set after she broke serve
early and the 19-year-old went on to seal a 6-4 6-1 win to set up a third-round clash against world number 71 Marina Erakovic.
Hantuchova broke serve
to lead 4-3 but Vekic responded in kind and then, once the set had gone to a tiebreaker, Vekic battled back from 5-2 down before succumbing 7-5.
The French Open champion and world No.1 broke serve
three times in the opening set and then recovered from a break behind in the first game of the second to take the match 6-1 6-4.
He had returned well all match in the circumstances and broke serve
again in the seventh game as he took the third set, but he was forced to settle for the lottery of a tie-break in the fourth and got a lucky break when Karlovic served a double fault at 4-4.
The Australian broke serve
in the second game of the match and, though Baltacha recovered and was back on serve at 5-4, she dropped her serve and the set in game 10 and it was one-way traffic from then on.
Murray, the second seed, made hard work of beating Marcos Baghdatis in the opening round, but was in no mood to hang around yesterday as he broke serve
five times to seal victory.
Murray broke serve
twice to march into an early lead but Baghdatis replied with three breaks of his own to take the first set and never looked back.
He broke serve
in the first set, only for Federer to break back immediately.
Murray then broke serve
after an epic game early in the third set before running away with the match as Tsonga battled body and mind, the Scot eventually winning 6-7 (5/7) 7-6 (7/5) 6-2 6-2.
Del Potro broke serve
twice in the second set and after levelling the match with an unstoppable forehand he looked the more likely winner.
However Nadal broke serve
at 4-4 in the second to level things up and was too good for his rival in the decider, running out a 4-6 6-4 6-3 winner.
Rain delayed the start of the match but it failed to disrupt Murray's rhythm as he broke serve
three times to take the first set.
Henman broke serve
in the opening game of the match and then consolidated to seize a 2-0 lead.