Team Penske drivers lead both Cup, Nationwide Series opening practices
Keselowski turned a fast lap of 179.004 mph on his seventh lap around the 1.5-mile track.
Second-fastest to Keselowski was Kevin Harvick at 178.950 mph. Harvick was the only driver still eligible to win the 2014 championship that finished in the top five. Ryan Newman was the second-fastest Chase driver in the field at 177.620 mph (ninth), with Denny Hamlin behind him in 11th place (177.497 mph) and Joey Logano finishing 22nd (175.838 mph) in the 90-minute session.
Danica Patrick (178.767 mph), Matt Kenseth (178.453 mph) and Kyle Larson (177.948 mph) rounded out the top-five fastest on the leaderboard.
Kurt Busch (sixth), Jeff Gordon (seventh), Jimmie Johnson (eighth), Newman and Kyle Busch (10th) rounded out the top 10.
The Sprint Cup Series will return to the track this evening for Coors Light Pole Qualifying at 6:15 p.m. ET with TV coverage on ESPN2.
Ryan Blaney, driver of the No. 12 Discount Tire Ford for Team Penske, led opening practice in the NASCAR Nationwide Series on Friday at Homestead-Miami Speedway. Blaney, who is making his 14th Nationwide Series start of the 2014 season, turned a lap of 167.942 mph on the 1.5-mile track.
Finishing in second place, 0.183 seconds behind Blaney, was Elliott Sadler, who is making his final Nationwide Series start for Joe Gibbs Racing before moving over to Roush Fenway Racing next year. Fellow JGR driver Matt Kenseth was third at 166.662 mph, followed by series champion and Sunoco Rookie Chase Elliott at 166.318 mph and his JR Motorsports teammate Regan Smith at 166.231 mph.
Smith, who made slight contact with the wall during practice, had damage to his right-rear panel but it likely wasn't enough to bring out a backup car.
Forty-two of the 43 cars entered in the Ford EcoBoost 300 (Saturday, 4:30 p.m. ET, ESPN2) made laps in Friday's opening practice, with Carlos Contreras, who is sporting a Pit Bull (the artist)-themed paint scheme, being the lone non-participant.
Nationwide Series final practice is set for 4 p.m. ET on Friday and can be seen on FOX Sports 1.