Thousands of excited fans crowded downtown Houston in anticipation for Monday's home opener during Opening Day for the Astros. 

The event started with a street festival in downtown Houston that took place from 2 p.m. to 6:30 p.m. as a pre-game to the opener against the Seattle Mariners that night. 

KHOU 11 viewers started sharing their fan photos early in the day.

Minute Maid Park was busy getting ready for the big game as people were filling up outside to take part in the festivities. KHOU 11's Matt Musil shared a video of all the excitement. 

Photos: Astros fans celebrate Opening Day at Street Fest

Some Mariners fans were even spotted in the crowds. 

Inside the stadium, players could be seen warming up. They talked about their anticipation for the game. 

Houston Astros legends and Hall of Famers Craig Biggio and Jeff Bagwell threw out and caught the first pitch, respectively. Country music star Clay Walker also sang the national anthem.

Photos: Biggio, Bagwell highlight pregame festivities on Opening Day

Fans inside the stadium spoke with KHOU 11's Shern-Min Chow about their hopes for this season. 

Other fans explained how opening day is a tradition for their family. 

Minute Maid Park recently underwent an $18 million dollar renovation on its center field and for other projects. 

The iconic Tal’s Hill is gone and other renovations include new bars and restaurants, including Torchy’s Tacos and Shake Shack. There are also new souvenir shops, seating areas and a mural painted by local artist Frank Cardona.

Photos: Fans enjoy center-field renovations at Astros' Opening Day

RELATED: Astros unveil center-field renovations at Minute Maid Park

Reid Ryan, President of the Houston Astros, spoke about the new features. 

Executive Chef Dom with Minute Maid and Aramark spoke with KHOU 11's Daniel Gotera about the delicious eats fans can now enjoy as part of opening day. 

With a new and improved atmosphere, the team hopes opening day is a home run for its fans.