Watch Robin Williams' Kids Honor Their Late Father at World Series

— -- Total class from the San Francisco Giants.

The team, which is battling the Kansas City Royals for a World Series trophy, had Robin Williams' children - Zak, Cody and Zelda - out to the mound to participate in the first pitch of Game 5 Sunday night.

"Fans, earlier this year, we lost a brilliant artist, a devoted husband and father, and a loyal Giants fan," the game announcer said of Williams, a devout Giants fan. "He had a heart of gold and brought joy to the world."

Then the audience was directed to the main scoreboard for a touching tribute filled with shots of Williams’ best movies, stand-up comedy and his trips to the stadium. It started with the comedian shouting "Good morning, Vietnam!" in a clip from his iconic film.

After the tribute, Williams' close friend Billy Crystal joined the kids to ceremoniously start the big game.

Crystal stood behind the plate and took the first pitch from Williams' eldest son, Zak, 31, while all the children wore San Fran jerseys that read Williams on the back. Crystal and all the children embraced after the toss.

What a way for the Giants to start off what ended up being a big win for the team, which leads the series 3-2.

Williams died at the age of 63 Aug. 11 of an apparent suicide.