COLOGNE, Germany -- Pablo Larrazabal made nine birdies -- including five in a row -- for a 9-under 63 and a share of the second-round lead, while U.S. Open winner Martin Kaymer failed to make the cut at the BMW International Open on Friday.
Local favorite Kaymer had four birdies, three bogeys and a double bogey to shoot a 1-over 73. His even-par 144 was well above the cut line at 4-under.
"(This) was a big step for me to accept that you have golf courses that don't suit your play, so it's OK for me," said Kaymer, who was born in nearby Duesseldorf. "It is how it is. I did my very best and level par was the best I could do."
"I played great today, I played great yesterday," Larrazabal said.
Grillo carded his second successive 66.
Cabrera-Bello double hit for his first missed shot of the week on the par-5 seventh but made five birdies while Willett, the 2012 tournament winner, stayed bogey-free to match his Spanish playing partner's 4-under 68.
"I was a little unlucky coming down the last few holes but, overall, pleased with the minus four," Cabrera-Bello said.
Andy Sullivan was level with the leaders with seven holes to play when play was suspended for almost 90 minutes due to a heavy storm. The Englishman dropped a shot on the par-5 No. 3 once play resumed and finished with a double bogey to finish on 9 under, three off the pace.
Spain's Miguel Angel Jimenez, Scotland's Craig Lee, South Africa's Branden Grace, Germany's Alex Cejka, Denmark's Andreas Harto, Sweden's Robert Karlsson were tied in fifth place, two shots behind the leaders.
Paul Waring had seven birdies and an eagle for a 63 as the Englishman was in an eight-way tie for 11th at 9-under.
Second-ranked Henrik Stenson shot a 4-under 68, and the Swede is among a group of 10 players at 8-under overall.
The Associated Press contributed to this report.