The No. 15 seed became the final piece of an all-American puzzle on Wednesday night at the USTA Billie Jean King National Tennis Center, joining three other Americans in the US Open semifinals. The Californian strolled confidently past Kaia Kanepi of Estonia, 6-3, 6-3.

Keys blasted eight aces in crushing Kanepi.

Four Americans in the semifinals is “pretty awesome,” said Keys.

The encounter between Keys and Kanepi would seem to be a mismatch, given that the American was seeking her second career major semifinal against a qualifier ranked a lowly No. 418. That, however, is not Kanepi’s natural place in the tennis order: the powerful 32-year-old was ranked as high as No. 15 in the world in 2012 and has been to a Grand Slam semifinal six different times in her professional career.

The Estonian has recently been slowed by a slew of injuries and health setbacks to her feet, battling plantar fasciitis issues in 2016.