The Joe Gibbs Racing Toyotas continued their domination Saturday morning at Dover International Speedway, site of Sunday's AAA 400 Drive For Autism NASCAR Sprint Cup Series race (FOX 12:30 p.m. ET).

In the first of two practices Saturday at the Monster Mile, JGR teammates Kyle Busch, Denny Hamlin and Carl Edwards swept the top three spots, with Busch turning a best lap of 157.839 miles per hour.

The first non-Toyotas were Ryan Newman, fourth in a Richard Childress Racing Chevrolet and Kurt Busch in a Stewart-Haas Racing Chevy.

JGR has won five of the last six races, with Kyle Busch winning three times and finishing second twice. The only race the team didn't win in the last six was at Talladega Superspeedway, where Brad Keselowski won in a Team Penske Ford.

Jimmie Johnson, who owns the Dover record with 10 victories here, was 12th-fastest in practice.

Three-time Cup champion Tony Stewart was just 34th in the Saturday morning session. Friday at Dover, Stewart had a hard impact after hitting rear-gear oil from teammate Danica Patrick's car.

The final, Happy Hour round of practice is at 12:30 p.m. ET on FS2.

Full results: