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Jayson Tatum throws out first pitch at Cardinals game alongside Bruins foe Matthew Tkachuk

Matthew Tkachuk is not exactly a popular figure in Boston after helping the Panthers eliminate the Bruins over the past two postseasons.

But the pugnacious power forward and St. Louis native is still on good terms with Celtics forward Jayson Tatum. The two superstars in their respective sports both attended Chaminade College Preparatory School in Missouri before charting their paths toward the NBA and NHL.

On Sunday, both Tatum and Tkachuk returned to St. Louis to throw out the first pitch at Busch Stadium before the Cardinals took on the Los Angeles Dodgers.

Both Tatum and Tkachuk have taken several victory laps this summer after playing key roles in championships for the Celtics and Panthers, respectively, in June.