American doubles pair Bob and Mike Bryan receive a fans' award and also beat pairing Lukas Dlouhy and Leander Paes to kick off the day's action at the O2
In the singles event, world number four Robin Soderling knew that victory over Roger Federer would give him a great chance of making the last four
And world number two Federer knew one set was enough to guarantee himself a place in last four - he won the first set of the match on a tie-break
Federer then took the second set and the match after gaining the crucial break in the eighth game - who awaits him in the last four?
Maradona and his friend Veronica Odeja (left) were in attendance to watch the match along with Federer's wife Miroslava Vavrinec
In the evening, it was the turn of Scot Andy Murray who knew that if he took a set off David Ferrer he would be in the semi-finals
The 23-year-old did just that breaking his Spanish opponent three times after he was broken in his opening service game
And after the pair exchanged breaks in the early stages of the second set, Murray stepped on the gas to claim the set and victory which gave him a berth in the last four
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