lose the zip on his fastball,

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Zip
zip

What Is The Definition Of Zip In Baseball?
What Is Zip In Baseball? Definition & Meaning On SportsLingo

1. This is a term used to describe a pitcher’s fastball in baseball. When a pitcher is said to have some “zip” on his fastball, it’s a positive description usually meaning that it has a high velocity or it is very hard to hit.

Examples Of How Zip Is Used In Commentary
1. The hitters are having a hard time making good contact on the pitcher’s fastball today as it appears to have a little more  zip than normal.

Sports The Term Is Used
1. Baseball

Age: Donald Trump's Biggest Fear?
Trump’s closest GOP rival also suggested that Trump has slowed down a bit intellectually since his first election almost eight years ago.

“This is a different Donald Trump than 2015 and ’16 — lost the zip on his fastball,” Gov. Ron DeSantis of Florida told reporters last week while campaigning in New Hampshire.