Cincinnati (Ohio), Aug 20 (DPA) Roger Federer and Andy Murray led an all-star field Wednesday at the Cincinnati Masters with wins into the third round as Rafael Nadal aimed to join his rivals with an opening victory on the fast hard-court.

Top seed Federer, revelling in his new role as father of twins, burst out of the blocks to claim his fifth victory against Argentine Jose Acasuso 6-3, 7-5.

Federer said he got up to speed quickly on the extremely fast courts at the Midwest venue.

'I was happy today because I know the transition to Cincy is always a difficult one,' said the 15-time Grand Slam champion, a two-time finalist.

'I've had very up and down results here. It just showed sort of how hard it is to get used to kind of courts. We don't usually play on these fast courts. That's why I'm very happy with today's match.'

The win lifted Federer's record to 43-7 on the season as he chases his fourth title of 2009 after winning the French Open and Wimbledon in recent weeks.

The winner in 69 minutes produced 14 aces and saved the only break point he faced.

Murray was untroubled by a passing shower, returning to the court after 25 minutes to complete a 7-6 (7-3), 6-2 win over Nicolas Almagro.

Murray's defeat in 85 minutes of the Spaniard sends him into a match with Czech Radek Stepanek, who inflicted a final career disappointment on retiring Russian Marat Safin 4-6, 6-3, 6-1.