At the start of the 2015 season, Yost led the team to a 7–0 start marking the second best start to a season in team history (the team's longest consecutive opening win streak, in 2003, was 9 games). On April 19, Yost was one of five Royals (also pitching coach Dave Eiland, bench coach Don Wakamatsu, pitcher Kelvin Herrera and shortstop Alcides Escobar) to be ejected in a game against the Oakland Athletics. Two games prior, Escobar had been injured following an attempt by A's third baseman Brett Lawrie to break up a double play. Considering the slide a dirty one, Royals pitcher Yordano Ventura hit Lawrie in the elbow the following game and was immediately ejected. In the series finale, A's pitcher Scott Kazmir hit Lorenzo Cain in the foot and warnings were given. Yost and Eiland were immediately ejected for arguing. Later in the 8th inning, Kelvin Herrera threw a 100 mph fastball behind Lawrie and a trio of ejections followed (Herrera, Wakamatsu and Escobar). The Royals won the game 4-2 despite the ejections.