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MLB rookies continue to make homer history

Mike Yastrzemski

When San Francisco Giants outfielder Mike Yastrzemski hit three home runs against the Arizona Diamondbacks last night, he added to the legend of the 2019 MLB rookie class.

Yastrzemski became the third rookie in the last week to hit three homers in a game, joining Yordan Alvarez of the Houston Astros and Aristides Aquino of the Cincinnati Reds.

Not only is this the first time that three different rookies have had three-homer games in a week, but the first time that three different rookies have had a three-homer game, period:

Alvarez has been one of the most prolific hitters in all of baseball since he debuted on June 9. Through just 51 games, Alvarez is slashing .339/.425/.688 with 17 homers and a 189 wRC+ value, which leads all qualified rookies. Alvarez also ranks fifth amongst rookies in fWAR.

While Alvarez has lit up American League pitching, Aquino has been a menace for National League opponents. After homering against St. Louis Cardinals pitcher Adam Wainwright on Friday evening, Aquino became the fastest player to reach 10 career homers, doing so in a staggering 16 games:

Granted, he has a small sample size to work with, but Aquino is currently slugging .961 with a 231 OPS+, and he suddenly looks like a vital piece for a Reds team that hopes to contend next season.

Yastrzemski–the grandson of Red Sox legend Carl Yastrzemski–has made a massive impact for a Giants team that continues to hang on for dear life in the Wild Card race.

In 70 games, Yastrzemski is slashing .272/.324/.548, and he is slashing .303/.356/.672 with 11 homers in the second half.