Bayliss increased his points total to 178 with two wins in Assen

Troy Bayliss won both races in round four of the World Superbike Championship in Assen to extend his lead at the top of the standings.

The Australian started from pole and claimed the first race after taking the lead with two thirds left to go when Yukio Kagayama made a mistake.

After an early four-way battle for the lead, Bayliss held off Japan's Nori Haga to also win the second race.

He now leads the title race by 70 points from Carlos Checa.

HANNspree Ten Kate Honda driver Checa moved up in the standings after two podium finishes in Assen, with Troy Corser third ahead of Fonsi Nieto.

Bayliss, who rides for Xerox Ducati, said: "It's been an incredible weekend, taking pole and two race wins is a great way to finish it off."

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The 39-year-old, who plans to retire at the end of the season, was particularly pleased to hold on to his lead over a long stint in the opening race.

"I'm very happy with the way it turned out," Bayliss said. "I made a really good start but it's a long time to be out there (in the lead) by yourself.

"I was looking around more than normal but I wanted to see where Carlos was."

Race one results:

1 Troy Bayliss (Aus) Ducati 36mins 50.907secs
2 Carlos Checa (Spa) Honda 36:53.039
3 Max Neukirchner (Ger) Suzuki 36:53.086
4 Yukio Kagayama (Jpn) Suzuki 37:01.826
5 Troy Corser (Aus) Yamaha 37:01.958
6 Jakub Smrz (Cze) Ducati 37:02.886
7 Ryuichi Kiyonari (Jpn) Honda 37:06.091
8 Makoto Tamada (Jpn) Kawasaki 37:09.302
9 Gregorio Lavilla (Spa) Honda 37:09.541
10 Max Biaggi (Ita) Ducati 37:11.606

Race two results:

1 Troy Bayliss (Aus) Ducati 36mins 46.238secs
2 Noriyuki Haga (Jpn) Yamaha 36:46.320
3 Carlos Checa (Spa) Honda 36:52.574
4 Ruben Xaus (Spa) Ducati 36:53.813
5 Max Neukirchner (Ger) Suzuki 36:54.249
6 Yukio Kagayama (Jpn) Suzuki 37:00.237
7 Gregorio Lavilla (Spa) Honda 37:01.453
8 Jakub Smrz (Cze) Ducati 37:02.614
9 Makoto Tamada (Jpn) Kawasaki 37:03.507
10 Troy Corser (Aus) Yamaha 37:04.618

World Superbikes rider standings:

1 Troy Bayliss (Aus) Ducati 178pts
2 Carlos Checa (Spa) Honda 108
3 Troy Corser (Aus) Yamaha 89
4 Fonsi Nieto (Spa) Suzuki 85
5 Ruben Xaus (Spa) Ducati 81
6 Noriyuki Haga (Jpn) Yamaha 67
7 Max Neukirchner (Ger) Suzuki 66
8 Max Biaggi (Ita) Ducati 54
9 Gregorio Lavilla (Spa) Honda 48
10 Lorenzo Lanzi (Ita) Ducati 42

Manufacturers's championship standings:

1 Ducati 190pts
2 Yamaha 126
3 Suzuki 113
4 Honda 109
5 Kawasaki 37