She still has a long way to go before the final, but whatever happens from here, this was a crucial victory for the world No. 1.

LONDON — Aryna Sabalenka trailed by a set, then twice was down a break in the third, before grabbing the last three games to reach the Wimbledon semifinals by overcoming 104th-ranked Laura Siegemund, 4-6, 6-2, 6-4, at Centre Court on Tuesday.

Aryna Sabalenka displayed frustration and anguish but battled back from a set down to reach the Wimbledon semi-finals. The world No1 appeared close to crashing out of the Championships at multiple occasions at the hands of the unseeded 37-year-old Laura Siegemund but won 4-6 6-2 6-4 in a fraught encounter on Centre Court.