No player has helped their team win this year more than Andrés Muñoz.
By the traditional metrics, Muñoz should easily take home AL Reliever of the Month for April. He finished the month with 19 strikeouts, 11 saves and zero runs allowed. But Muñoz wasn’t just highly effective in April — he was highly effective in crucial moments.
Muñoz leads MLB in Win Probability Added (WPA) at 2.16. While most advanced metrics are context neutral (a homer is a homer is a homer), WPA measures how much any event in a game contributes to a team’s chance of winning — i.