Toronto, Canada – DOHA (Reuters) - World number one Roger Federer made light of the chilly conditions to ease into the quarter-finals of the Qatar Open with a 6-2 6-4 win over Russian Evgeny Korolev on Wednesday.
"I was hitting the ball hard because the weather was quite chilly. Evgeny is a promising player, so I didn't want to take chances," said Federer.
"I've been playing well lately. Today's victory underlines that I'm in very good form," said the Spaniard. "Potito has always been a tough opponent for me."
Federer next faces Latvian Ernests Gulbis while Nadal will face Belgian Steve Darcis.
(Editing by Justin Palmer)