The Tampa Bay Rays challenged a play on the field 55 times in 2018, the highest of any team, comprising 33.9% of their games played, and 3.81% of all challenges. Not included in that breakdown are challenges initiated by umpires, which was the largest slice of the pie, 10.8% of challenges.
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The next closest franchises were Boston with 53, and Colorado with 51. No other teams initiated more than 50 challenges.
The Rays were successful in 29 of their initiated replays (52.7%), which is better than the average on all replays challenged (48.