• Rafael Nadal poses with the 2013 ATP world No.1 trophy as the 2013 ATP Comeback Player of the Year award, which he also won, sits on its plinth
  • Switzerland's Roger Federer enters the court to play a 'winner takes all' match against Argentina's Juan Martin del Potro...
  • ...as wife Mirka watches on
  • Federer returns against Del Potro during their Group B singles match...
  • ...but Del Potro races to a 5-1 first-set lead after two breaks...
  • ...before Federer hits back to 5-4 and advantage on the Del Potro serve...
  • ...but the Argentinean holds his serve to take the first set 6-4
  • Del Potro pushes on to register a 3-1 lead in the second set...
  • ...but Federer hits back to take a 4-3 lead...
  • ...and the Swiss veteran wins the second set tie-break 7-2 to level the match
  • The players continue to do battle in the deciding set...
  • ...which Federer wins 7-5 to progress into the semi-finals and a meeting with Nadal
  • Novak Djokovic warmed up for Sunday's semi-final with a three-sets victory over Richard Gasquet
  • The Serbian defending champion already knew he would be facing Stanislas Wawrinka in the last four but was looking for a good workout..
  • .. and he got it. Although Djokovic won the first set on a tie-break, Gasquet hit back to win the second 6-4 and send the match to a decider..
  • ..but Djokovic showed his mettle to win it 6-3 and take victory
  • Djokovic celebrates what was his 20th straight win since the final of the US Open

ATP World Tour Finals - Day 6

Rafael Nadal poses with the 2013 ATP world No.1 trophy as the 2013 ATP Comeback Player of the Year award, which he also won, sits on its plinth