It's Ken Caminiti’s birthday — he was born on April 21, 1963.
Here's the birth announcement from the Hanford Sentinel.
While Ken was born in Hanford, in south-central California, his family moved to San Jose when he was a baby, and that's where he spent his childhood.
Notably, Ken didn't have a lot of luck on his birthday during his career. He went 4-for-32 at the plate, good for a .125 batting average, on April 21. But he was often a slow starter, or he would be battling through some early-season injuries, whenever his birthday came around.
His best April 21 performance probably came in 1989, his first full MLB season, when his RBI single helped the Astros to a 7-0 win against the Reds. It also extended Ken’s hitting streak to 10 games — the longest hitting streak of his early MLB career.