AUSTIN, Texas (AP) - Nico Rosberg navigated wet conditions at the Circuit of the Americas to post the fastest time in Friday's practice session for the United States Grand Prix.
The afternoon session was canceled after a one-hour lightning delay.
With the cars shooting giants plumes of spray behind them Friday morning, Rosberg's fastest time was a 1:53.989. Points leader and Mercedes teammate Lewis Hamilton was fifth at 1:55.693 after taking just four laps.
Hamilton is chasing his second consecutive world championship and third overall. He'll clinch the title if he finishes nine points ahead of Ferrari's Sebastian Vettel and two points ahead of Rosberg on Sunday.
Hamilton may have to battle wet conditions all weekend. Forecasters predict heavy rain through Saturday with the potential for some showers again Sunday.
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