April 15 is a special day in baseball history. "Jackie Robinson Day" celebrates the baseball legend's MLB debut with the Brooklyn Dodgers on April 15, 1947, an appearance that broke MLB's color barrier. Seventy-two years later, Robinson's legacy lives on, as teams sport Robinson's now-retired No. 42 on his anniversary to honor his contributions to baseball.

Naturally, plenty of MLB players also came out to say thanks to Robinson and his contributions to the game, including Robinson Cano and Bryce Harper who will both wear unique pairs of Jackie Robinson cleats on Monday.

Robinson lettered in four sports -- baseball, track and field, football and basketball -- at UCLA, a record that will certainly never be matched. As a tribute to Robinson's time at UCLA, Harper collaborated with Under Armour for a UCLA-inspired UA Harper 3 that he'll be wearing for the Phillies on Monday night. Note the number 42 on the bottom, but there's also 28, which Robinson wore for the UCLA Bruins: 

Under Armour
Under Armour

But the player tributes, of course, didn't end there.

The Los Angeles Dodgers are also donning throwback duds to honor one of the most important players in their illustrious history, including the Brooklyn "B."