Michel Fabrizio maintained his place at the top of the timesheets as the second day of testing at Kyalami drew to a close, the Italian destroying his own lap record as he dominated proceedings throughout.
The Italian, who undercut Colin Edwards' six-year-old marker on day one of testing, made the most of hot weather conditions and a scrubbed circuit to immediately dip underneath his day-old record.
However, while he was joined in the 1min 40secs bracket by six other riders, Fabrizio's 1min 40.256secs was still a second quicker than he managed on day one, while it also placed him a clear four tenths up on the nearest competition.
Even so, Fabrizio wasn't entirely satisfied with his performance, boldly stating that he is capable of breaking the 1min 40secs mark.
"I'm not entirely satisfied today either because I made a small mistake on my good lap, otherwise I'm convinced I could have got below the 1'40" mark."
Max Neukirchner proved Fabrizio's closest challenger, the German continuing to set a strong pace aboard the new Alstare Suzuki, while Noriyuki Haga enjoyed a far less eventful second day with the Ducati Xerox team on the way to the third best time, half a second adrift from younger team-mate Fabrizio.
Following a quiet day of running yesterday, Ten Kate Honda proved far more prolific today, with Jonathan Rea making the biggest gain of all the riders in fourth position. Carlos Checa was also a big improver in seventh.
Yukio Kagayama kept up Suzuki's encouraging early form in fifth, ahead of Aprilia pairing Shinya Nakano and Max Biaggi in sixth and ninth, the pair remaining well in touch with the ultimate pace on their first proper outing aboard the RSV-4.
After proving quick straight out of the box yesterday, Ben Spies adopted a more conservative pace today in eighth position, although his cause wasn't aided by a crash midway through the day that damaged his Yamaha R1.
Still, he fared better than team-mate Tom Sykes, who made a tentative return to action after withdrawing with illness on day one. He was 13th and slowest after completing just a further 18 laps.
Between them sat Ryuichi Kiyonari on the third Honda, as well as the two BMWs of Troy Corser and Ruben Xaus. Although both riders knocked around a second off their times, both remained on the cusp of the top ten throughout the day.