Retro Baseball 101 - Tony Pena was known for his unique style of catching. He would sit on the ground with one knee tucked to the side while his other leg was
What Catchers Don't Do, But Should.
Catcher Stance 3: Blocking Situation
Why don't more catchers drop a knee?
Top 12 MLB Players at Each Position in the Game: Catchers, News, Scores, Highlights, Stats, and Rumors
Do One-Knee Setups Hinder A Catcher's Blocking Ability? — College Baseball, MLB Draft, Prospects - Baseball America
How the knee-down revolution changed catching - without downgrading defense
Catching 101 - Little League
Angels News: Max Stassi Believes Changing Catching Stance Is 'Really Going To Help