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Serena Williams celebrates match point in her quarter-final match against Alison Riske on Tuesday at the All England Club in London. Williams marched to her 12th semifinal at Wimbledon, landing 81 per cent of her returns in a 6-4, 4-6, 6-3 win. (Mike Hewitt/Getty Images)

Matches completed Tuesday:

🇺🇸 Serena Williams (USA) (11) def. 🇺🇸 Alison Riske (USA)  2-1
7 players had match winner correct
0 players had match score correct

🇨🇿 Barbora Strycova (CZE) def. 🇬🇧 Johanna Konta (GBR) (19) 2-0
2 players (Petr, Eva) had match winner correct
2 players (Petr, Eva) had match score correct

🇺🇦 Elina Svitolina (UKR) (8) def. 🇨🇿 Karolina Muchova (CZE) 2-0
5 players had match winner correct
4 players had match score correct

🇷🇴 Simona Halep (ROM) (7) def. 🇨🇳 Shuai Zhang (CHN) 2-0
7 players had match winner correct
5 players had match score correct

For download (PDF): Wimbledon Prediction Challenge! 2019 Quarter-finals Ladies

Quarter-finals
1 Petr Havlik 51
2 John Lo 36
Logan Zetaruk 36
4 Wes Zetaruk 22
Michael Poplawski 22
6 Eva Kafková 17
7 Serene Ford 16

Prizes
🥇 $35.00 🥈 $24.50 🥉 $10.50