AUSTIN, Texas -- Red Bull went 1-2 in the Friday afternoon practice at the U.S. Grand Prix with series champion Sebastian Vettel posting the fastest time ahead of teammate Mark Webber.
Vettel's time of 1 minute, 37.305 seconds was the quickest of the two practice sessions. Webber, who has two races left in his Formula One career, was 0.115 seconds behind.
Ferrari's Fernando Alonso posted the fastest time in the first session in 1:38.343.
McLaren's Jenson Button, who was second-fastest in the morning practice, was later hit with a three-place penalty in Sunday's starting grid for passing another car when race officials had put the first session under a red flag.
The morning practice was stopped after about 15 minutes because the medical helicopter had not yet arrived at the track.