Unless you have been living in a cave or submerged in a sensory deprivation chamber, then you know that soccer's World Cup started on Thursday. Even if they didn't have a rooting interest in the opening match between host country Brazil and Croatia, many tennis players still wanted to show their support through social media, especially Twitter.
Here are some of the best tweets posted on opening day.
A few players made a point to call out a controversial call that went in favor of Brazil.
Some decided on alternative programming.
While others reflected on childhood memories.