Maria Sharapova kept a half-full Centre-Court crowd entertained as she brushed aside 33-year-old Amy Frazier to reach the fourth round.

The show court, packed to the rafters to witness Andre Agassi's Wimbledon farewell, rapidly emptied in time for another American veteran arrived to take his place.

Sharapova, the 2004 champion who had dropped just six games and spent under two hours on court in her first two matches, was at least forced to break sweat under the hot sun before clinching a 6-3 6-2 win.

She now plays 16th seed Flavia Pennetta, of Italy, for a place in the quarter-finals.

The Russian teenager, who was still in nappies when Frazier played the first of a record 70 Grand Slam events 19 years ago, broke her 80th-ranked opponent in the second game and blasted down two aces in the fifth to open up a 4-1 lead.

The wily Frazier, who has never been past the fourth round in 17 previous visits to Wimbledon, lost in straight sets to Sharapova in 2004 and did little to suggest she could break her duck against the Russian.

She struggled on her own serve, producing five double faults in her first two service games, but forced her opponent to dig deep to save three break points in the ninth game before Sharapova served out to take the set 6-3 in 43 minutes.

Frazier showed her battling qualities to extend the rallies but the end was in sight when she dropped her serve in the third game of the second set.

When her serve was challenged in the next game, Sharapova simply pulled out a fourth ace to snuff out the threat and, as if to emphasise the point, produced a love game to go 4-2 ahead.

The American played some of her best tennis of the match in the next game but was still broken for a second time as the former champion went through the gears.