Swiatek, Gauff lose at Australian Open; Korda in 1st Slam QF

  • Sebastian Korda of the U.S. celebrates after defeating Daniil Medvedev of Russia in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday. (AP Photo/Aaron Favila)

  • Elena Rybakina, left, of Kazakhstan, left, is congratulated by Iga Swiatek of Poland after their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday. (AP Photo/Mark Baker)

MELBOURNE, Australia — It all came so seemingly easy for Iga Swiatek last season — two Grand Slam trophies, eight titles overall, a 37-match winning streak, a lengthy stay at No. 1 in the rankings.