Newsmakers from Sunday's action:

Jack Flaherty, RHP, Memphis (Cardinals): Flaherty's promotion to Triple-A in early June was supposed to provide the final challenge he needed to be big league ready. So far, it hasn't been all that challenging for the righthander. After acclimating in June, Flaherty is 3-0, 1.62 in his last six starts, including yesterday's seven shutout innings.

Brendan McKay, LHP, Hudson Valley (Rays): A day after serving as Hudson Valley's designated hitter, McKay made his second pitching appearance as a pro, allowing one hit in three scoreless innings. McKay's pro debut has gone better on the mound, where he's allowed one hit and stuck out seven in five innings, then at the plate where he he is hitting .200/.297/.327.

Christian Walker, 1B, Reno (Diamondbacks): Walker found himself caught in roster no-man's land this offseason as a trio of teams decided he was valuable enough to keep, but not valuable enough to keep on the 40-man roster. The Orioles, Braves and Reds all waived Walker, but the Diamondbacks were the team that managed to keep Walker and get him off the 40-man roster. Hitting in the paradise that is Reno, Walker has responded by ranking among the minors home run leaders all season. With two home runs yesterday, Walker has 28, two behind Renato Nunez for the minor league lead.

Willie Calhoun, LF, Round Rock (Rangers): Since being traded to the Rangers in the Yu Darvish deal, Calhoun has played left field four times and second base once, giving some indication of where the Rangers think his future lies. He's also hit four home runs in five games, giving a reminder of why his not-to-distant future likely involves a promotion to the big leagues.

Fernando Tatis Jr., SS, Fort Wayne (Padres): In the first half of the season, Tatis stood out because he was an 18-year-old who wasn't overmatched by Midwest League pitching. In the second half of the season, Tatis has stood out by taking a wrecking ball to the rest of the league. He homered against yesterday, improving his post all-star break stat line to .286/.422/.629. He has 10 home runs and 16 steals in his past 140 at-bats while walking 32 times compared to 38 strikeouts.

Cam Gallagher, C, Kansas City (Royals): Gallagher made his big league debut yesterday as he was called up to replace the injured Salvador Perez. Gallagher fits the backup catcher profile perfectly as a glove-first catcher with modest offensive skills.