Federer through in epic

Roger Federer is through to the final of the Olympic men's tennis event following an epic 3-6 7-6 19-17 win over Juan Martin Del Potro.

The Swiss has never won an Olympic singles medal, but will now play for gold when he takes on either Andy Murray or Novak Djokovic in Sunday's final.
He was made to work though by a battling Del Potro, with the match lasting four hours and 26 minutes - a record for an Olympic singles match.
The 2012 Wimbledon champion started slowly and was outplayed by the current world number nine, who took the first set 6-3.
Federer saved a break point in the second set that would have given his Argentine opponent the chance to serve for the match, with the second eventually going to a tie-break that Federer won 7-5 to set up a deciding set.
He broke Del Potro in the 19th game to take a 10-9 lead but then failed to serve out the match, meaning the ding-dong battle continued to rumble on.
The clock then ticked well beyond the three hour 59 minute mark, breaking the record for the longest ever Olympic singles match set by Jo-Wilfried Tsonga and Milos Raonic just 48 hours previously.
Federer broke his opponent for the second time in the 35th game of a mammoth set, giving him another chance to serve for the match.
A match point went begging when Federer planted a relatively simple volley into the net, but he wasn't to be denied moments later when a devastated Del Porto netted a baseline forehand to seal the victory for the legendary Swiss.