Roddick and Schalken through

Second seed Andy Roddick has joined Roger Federer in the fourth round of Wimbledon, beating Taylor Dent 6-3, 7-6 (8-6), 7-6 (7-1).

Seventeenth seed Jonas Bjorkman was ejected from the tournament by fellow Swede Joachim Johansson 6-7 (5-7), 7-6 (7-5), 7-6 (8-6), 6-3.

Another veteran Swede, Thomas Enqvist, also bowed out, beaten 5-7, 6-2, 3-6, 7-6 (10-8), 6-2 by 12th seed Sjeng Schalken.

Croat Ivo Karlovic went back to familiar giant-killing ways, this time seeing off 18th seed, Spain's Feliciano Lopez, 7-6 (14-12) 7-6 (7-3) 6-7 (2-7) 7-5.