Bayliss has been in fine form on his Ducati this season

The Australian, who earlier had claimed eight in a row after winning race one, worked his way up to third place but slid out on the 17th lap.

Australia's Andrew Pitt claimed his first ever World Superbike triumph after dominating the second race.

Defending champion Troy Corser had a miserable weekend as he crashed twice.

In the second race in Misano, he was leading but slid off while negotiating the final chicane of the eighth lap.

His title defence now looks in serious trouble as he trails Bayliss by a whopping 105 points.

Bayliss did finish the race in 12th after desperately picking up his Ducati out of the gravel.

The last lap I could see the crowd going crazy and was able to enjoy it. What a day Andrew Pitt

The incident ruined his chances of equalling the record of nine straight wins which is held by Colin Edwards and Neil Hodgson.

Earlier, Bayliss continued his domination of the championship despite starting from seventh on the grid in race one.

The Australian took almost half the race to work his way to the front but still took his eighth consecutive race win.

James Toseland, the 2004 champion, gained 20 points and moved up to second in the standings after finishing second in the first race.

He looked to be heading for a similar result in race two but he ran way wide over the gravel on the 18th lap and finished eighth.

With Corser, Bayliss and Toseland out of the reckoning, Pitt was left an easy run-in to win in 40 minutes, 18.671 seconds.

"I don't know how I feel at the moment, it's unbelievable. I'm shivering all over, what a relief," said Pitt.

"The last lap I could see the crowd going crazy and was able to enjoy it. What a day."

The Yamaha rider finished ahead of Brazilian Alex Barros while Nori Haga of Japan was third.

Haga was involved in a thrilling battle with Britain's Chris Walker for most of the race and just managed to hold on to the final podium place.

In race one, Suzuki's Yukio Kagayama was third while Barros came fourth.

Bayliss now leads the championships standings by 94 points from Haga.

World Superbikes round six results, San Marino

Race one:
1 Troy Bayliss (Aus) Ducati 40mins 06.480secs
2 James Toseland (GB) Honda 40:13.423
3 Yukio Kagayama (Jpn) Suzuki 40:16.621
4 Alex Barros (Brz) Honda 40:21.497
5 Noriyuki Haga (Jpn) Yamaha 40:21.856
6 Regis Laconi (Fr) Kawasaki 40:23.243
7 Lorenzo Lanzi (It) Ducati 40:30.337
8 Fonsi Nieto (Sp) Kawasaki 40:40.647
9 Ruben Xaus (Sp) Ducati 40:41.734
10 Norick Abe (Jpn) Yamaha 40:41.815

Race two:
1 Andrew Pitt (Aus) Yamaha 40mins 18.671secs
2 Alex Barros (Brz) Honda 40:21.388
3 Noriyuki Haga (Jpn) Yamaha 40:25.230
4 Chris Walker (GB) Kawasaki 40:25.771
5 Yukio Kagayama (Jpn) Suzuki 40:25.947
6 Michel Fabrizio (It) Honda 40:32.587
7 Lorenzo Lanzi (It) Ducati 40:32.819
8 James Toseland (GB) Honda 40:33.736
9 Ruben Xaus (Sp) Ducati 40:34.105
10 Fabien Foret (Fr) Suzuki 40:39.250

Overall driver standings:
1 Troy Bayliss (Aus) 254pts
2 Noriyuki Haga (Jpn) 160
3 James Toseland (GB) 157
4 Troy Corser (Aus) 149
5 Alex Barros (Brz) 146
6 Andrew Pitt (Aus) 128
7 Lorenzo Lanzi (It) 80
8 Ruben Xaus (Sp) 70
9 Chris Walker (GB) 64
10 Fonsi Nieto (Sp) 61

Overall constructor standings:
1 Ducati 260pts
2 Honda 196
3 Suzuki 188
4 Yamaha 180
5 Kawasaki 98
6 Petronas 4