"Most people run their quickest times with people around them," Dasaolu said.
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The pair played cat and mouse in a nervous, 49-minute, ninth frame but once Selby had edged in front he wrapped up the victory in quick time with a smooth 101 break.
Gameplay is fairly self-explanatory: You control the hand of an amateur surgeon who must successfully perform heart surgery, "complet[ing] the operation in the quickest time possible, with minimal blood loss".
Coulthard set the quickest time of the session with a lap of 1 29.752, ahead of Schumacher, Alesi and Salo, with Hill, Barrichello, Brundle, Badoer, Irvine and Frentzen completing the top ten.
Purchase and Hunter, who struggled with injury and illness during last season, progressed with the quickest time of all in the lightweight double heats - three seconds faster than next best Italy.
In stark contrast, his British team-mate Perri Shakes-Drayton sailed into the semi-finals with the quickest time of all the 16 qualifiers.
"Even though it doesn't mean too much, it's always nice to start the season with the quickest time of the day," said Button.
Each second counts for one point, with penalties added at the end, and the winner is the competitor with the quickest time after penalties are accounted for.
