WATCH: Thiem shares why he plays for the ocean

Though he is now an ATP Masters 1000 champion, Dominic Thiem still makes time to give back.

In an ATP "My Story" feature, he talked about his commitment to supporting the environment through 4ocean, an organization that seeks to build a more habitable ecosystem for marine life through preserving the world’s oceans. In just two years, 4ocean has removed more than four million pounds of trash from oceans.

"It's a really good cause. It's one of the biggest problems nowadays we face, with all the plastic pollution,” Thiem said. “I'm loving nature [and] I'm loving animals, so I try to support wherever I can."

After defeating Roger Federer in three sets on Sunday to win the biggest title of his career, the 25-year-old has returned this week to his career-high ranking of No. 4 in the world.