'The GOAT of all GOATS': Sports world celebrates Serena Williams

Serena Williams' career likely came to a close Friday night

 three-set loss to Ajla Tomljanovic in the third round of the U.S.

Despite the setback

the 40-year-old's brilliance was on display once again

  she's perhaps the greatest tennis player of all time.

The emotion showed for Williams after the match,

especially when she began thanking her family.