Jimmy Garoppolo, Patrick Mahomes Face Off At Super Bowl Opening Night

Friendliest Super Bowl ever?!?!?

The San Francisco 49ers and Kansas City Chiefs came face-to-face at Marlins Park in Miami on Monday night ... and THEY COULDN'T HAVE BEEN NICER!!

Patrick Mahomes, Jimmy Garoppolo, Richard Sherman, Tyrann Mathieu and more were shaking hands, cracking jokes and posing for pics together ... just days before they do battle!

It's actually really nice to see ... ferocious competitors being super respectful and enjoying the moment before Sunday's big game.

During the Opening Night festivities, players from both teams remembered Kobe Bryant and talked about the impact he's had on their lives.

In fact, 49ers superstar tight end George Kittle said Kobe was "the reason I played sports."