RELATED: Full practice results
Joe Gibbs Racing rookie Daniel Suarez topped the lone NASCAR XFINITY Series practice at Chicagoland Speedway. Suarez's fast lap of 177.713 mph topped the charts of the 145-minute session.
In fact, three JGR cars made up the top four with another Toyota (J.J. Yeley) making it a clean sweep of the top four spots in practice. Yeley was second in the session (176.725 mph), followed by the JGR duo of Kyle Busch (176.079 mph) and Matt Kenseth (175.833 mph).
Richard Childress Racing took four of the top 10 spots with Paul Menard (5th, 175.154 mph), Ty Dillon (6th, 174.859 mph), Brendan Gaughan (7th, 174.672 mph) and Brian Scott (10th, 174.014 mph).
Entering this weekend, Chris Buescher holds a 21-point lead over defending series champion Chase Elliott in the championship battle, with Dillon 27 points back and Regan Smith 49 points behind. Buescher finished 16th in practice, while Elliott (who won last week at Richmond) finished 19th and Smith, his JR Motorsports teammate, finished 14th.
Friday's practice was the only on-track time of the day for the XFINITY Series drivers. Saturday will be a busy day for the series with Coors Light Pole Qualifying taking place at 2:45 p.m. ET (NBCSN/Live Extra) and the Furious 7 300 at 6 p.m. ET (NBCSN/Live Extra, MRN, SiriusXM NASCAR Radio).