Before Castillo stepped on the mound to face the New York Yankees, the Seattle Mariners gave their new starting pitcher six runs to work.
"USA TODAY" sports columnist Bob Nightengale set off MLB fans with a tweet regarding the Mariners' strong start to the game. Nightengale took a shot at Castillo's former team, the Cincinnati Reds, and said Castillo was on a better offensive team now.
MLB fans quickly reacted to the tweet and let Nightengale know that the Reds rank higher than the Mariners in runs scored this season.
Another fan joined in and let Nightengale know that the Reds have a higher batting average than the Mariners. Cincinnati is No. 18 in the MLB and Seattle in No. 24.
One Reds player, infielder Kyle Farmer, joined in the Twitter fun.
Farmer responded with a laughing emoji to a photo a fan tweeted showing Cincinnati ahead of Seattle in runs scored this season.
More struggles for New York Yankees' Gerrit Cole
While Mariners fans celebrated a strong start to the game for Castillo, Yankees fans were mad on the other side. Fans of other teams didn't feel the same way.
Yankees' starting pitcher Gerrit Cole was on the mound and gave up six runs and three home runs. After a dreadful start, Cole still managed to go six innings.