Race 12 of 18 - Brno, Czech Republic
- Date: Saturday 25 (qualifying) - Sunday 26 August (race)
- Start time: 11:55 - 1505 BST (Sat); 12:30 - 1400 BST (Sun)
Coverage: Race live on BBC Two and the BBC Sport website; qualifying on Red Button and BBC Sport website
Dani Pedrosa edged out championship rival and fellow Spaniard Jorge Lorenzo in practice ahead of the Czech MotoGP.
The 26-year-old Repsol Honda rider, 18 points adrift in the standings, was 0.146 and 0.053 seconds quicker than his Yamaha rival in the two sessions.
The title race seems to be a two-horse race after
defending world champion Casey Stoner's crash
Britain's Cal Crutchlow, fifth in the championship, was fourth fastest in both sessions ahead of Sunday's race.
- Jorge Lorenzo (Spa) Yamaha, 225 points
- Dani Pedrosa (Spa) Repsol Honda, 207
- Casey Stoner (Aus) Repsol Honda, 186
- Andrea Dovizioso (Ita) Tech 3 Yamaha, 137
- Cal Crutchlow (GB) Tech 3 Yamaha, 106
Stoner, who is due to retire at the end of the season, suffered multiple chip fractures and four torn ligaments in his right ankle following a crash during qualifying.
Despite his injuries, the Australian was cleared to race last Sunday and finished fourth.
He then flew to the Czech Republic but, after speaking to doctors, later left for Australia to have surgery.
"The worst thing to do would be to keep going, to keep riding with it," Stoner said the doctor told him.
"And the best thing to do would be to get back and have surgery as soon as possible, so that gives us the quickest recovery rate before the end of the season and hopefully we can get back.
"Hopefully I'll get a few races before the end of the season."
Lorenzo, 25, walked away from a crash midway through the second session, staged in very hot conditions.
He said: "Today was much better than Indianapolis [when he finished 10 seconds behind Pedrosa].
"We tried to improve the bike but we still need to find some solutions for more grip in the corners. I had a small crash in a slow corner, I tried to lean a little more and found the limit of the grip.
"I'm quite satisfied overall, we are there with Dani fighting for the best lap time every practice which is good."
The Spaniard was fine to continue after his accident, as was Honda's Alvaro Bautista, who was pushing to improve upon his seventh-fastest time.
And with two minutes remaining, Aspar's Aleix Espargaro also dropped his bike in the gravel.
Second practice times and standings for Czech Grand Prix
1. Dani Pedrosa (Spa) Repsol Honda, one minute 56.858 seconds
2. Jorge Lorenzo (Spa) Yamaha, 1:56.911
3. Andrea Dovizioso (Ita) Tech 3 Yamaha, 1:57.055
4. Cal Crutchlow (GB) Tech 3 Yamaha, 1:57.215
5. Stefan Bradl (Ger) Honda, 1:57.250
6. Valentino Rossi (Ita) Ducati, 1:57.315