Sir Chris Hoy won gold in the men's sprint competition at the Track Cycling World Cup opener in Kazakhstan.
The four-time Olympic champion, who pulled out of the recent European Championships with a chest infection, also clinched silver in Saturday's keirin event in Astana.
Hoy, who won sprint gold at the 2008 Olympics, beat Russia's Denis Dmitriev 2-0 in the best-of-three final.
Britain's Dani King also won the silver in the six-discipline women's omnium.
Hoy, 35, beat team-mate Matt Crampton in the last eight, while Jason Kenny crashed out in the last 16 but ended with a second-place finish in the B final.
Scotland's Hoy then came from behind to beat Germany's Robert Forstemann 2-1 in the semi-final.
King, lying fourth overnight in the omnium, climbed into second with victory in the individual pursuit, finished sixth in the scratch race and secured her silver medal with a second-place finish in the 500m time trial.
Her fellow Britons Becky James and Jess Varnish were unable to progress to the final of the women's keirin.