William Yarbrough's Club Leon was replaced by Omar Gonzalez's Pachuca at the top of the Liga MX Clausura 2016 table after the fourth round of matches this weekend.
Goalkeeper Yarbrough retained his starting place for Juan Antonio Pizzi's final game in charge of La Fiera on Saturday, but couldn't stop his team from falling 3-1 away to reigning Liga MX champion Tigres.
The Mexico-born U.S. international slipped slightly to allow Andre-Pierre Gignac an easy finish for Tigres' opener, although he did make up for it with some fine saves in the second half at the Estadio Universitario.
That result allowed Pachuca to capitalize and Gonzalez's team did so in some style, defeating Monterrey 3-1, also on Saturday.
Defender Gonzalez was cautioned in the 42nd minute for a late tackle on Uruguayan Carlos Sanchez, but the former L.A. Galaxy defender is starting to form a solid center-back partnership with Colombian Oscar Murillo.
For Monterrey, Edgar Castillo came off the bench in the 65th minute to replace Darlon Pabon.
Over in Torreon on Friday, it was the battle of U.S. left-backs as Jorge Villafana lined up for Santos Laguna against Jonathan Bornstein and Queretaro.
Both went 90 minutes for their respective teams, but it was Villafana's Santos that won 2-0 to lift the Guerreros to within a point of Pachuca.
Luis Gil played 64 minutes for Gallos Blancos, although he didn't have the influence he would've liked from central midfield in a game Santos dominated.
The other American starter this weekend was Sonny Guadarrama for Dorados de Sinaloa. Guadarrama played on the left wing and had a long range shot blocked in the 79th, but it wasn't enough to stop relegation candidates Dorados losing 3-0 and extending their scoreless streak to 540 minutes in the Liga MX.
Dorados' other U.S. player, Joe Corona, watched on from the bench while America's Ventura Alvarado was left out of the 18 by coach Ignacio Ambriz.
Finally, flying winger Paul Arriola came on for the final 20 minutes of Club Tijuana's 2-2 away draw with Veracruz on Friday.
Xolos had gone down to 10 men when Leiton Jimenez was sent off in the sixth minute but Miguel Herrera's side battled back to earn a point.