Roger Federer says thinking about winning his 100th singles title would only add extra pressure before his ATP Finals semi-final against young German Alexander Zverev at the O2 in London.
Federer is aiming to become only the second man - after American Jimmy Connors - to reach the landmark.
"I won't let that get in my head," said the 37-year-old Swiss.
The second seed faces Zverev at 14:00 GMT on Saturday before Novak Djokovic and Kevin Anderson meet at 20:00.
The winners meet in the final of the season-ending tournament at 18:00 on Sunday.
| Saturday's order of play |
|---|
| Afternoon session - 12:00 GMT |
| Jamie Murray (GBR)/Bruno Soares (Bra) v Mike Bryan/Jack Sock (US) |
| Roger Federer (Sui) v Alexander Zverev (Ger) |
| Evening session - 18:00 GMT |
| Pierre-Hugues Herbert/Nicolas Mahut (Fra) v Juan Sebastian Cabal/Robert Farah (Col) |
| Novak Djokovic (Ser) v Kevin Anderson (SA) |
Federer lost his opening match with a below-par performance against Kei Nishikori, before returning to form in straight-set wins over Dominic Thiem and Kevin Anderson.