WTA Player Stats - Simona Halep
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| US Open | ||
| Surface: Hard | Date: Aug. 27 - Sep. 9 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Kaia Kanepi | Loss | 2-6, 4-6 |
| Western & Southern Womens Open | ||
| Surface: Hard | Date: Aug. 12 - Aug. 19 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Ajla Tomljanovic | Win | 4-6, 6-3, 6-3 |
| Third Round | Ashleigh Barty | Win | 7-5, 6-4 |
| Quarterfinals | Lesia Tsurenko | Win | 6-4, 6-1 |
| Semifinals | Aryna Sabalenka | Win | 6-3, 6-4 |
| Final | Kiki Bertens | Loss | 6-2, 6-7 (6-8), 2-6 |
| Coupe Rogers presentee par Banque Nationale | ||
| Surface: Hard | Date: Aug. 6 - Aug. 12 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Anastasia Pavlyuchenkova | Win | 7-6 (11-9), 4-6, 7-5 |
| Third Round | Venus Williams | Win | 6-2, 6-2 |
| Quarterfinals | Caroline Garcia | Win | 7-5, 6-1 |
| Semifinals | Ashleigh Barty | Win | 6-4, 6-1 |
| Final | Sloane Stephens | Win | 7-6 (8-6), 3-6, 6-4 |
| Wimbledon | ||
| Surface: Grass | Date: Jul. 2 - Jul. 15 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Kurumi Nara | Win | 6-2, 6-4 |
| Second Round | Saisai Zheng | Win | 7-5, 6-0 |
| Third Round | Su-Wei Hsieh | Loss | 6-3, 4-6, 5-7 |
| Roland Garros | ||
| Surface: Red Clay | Date: May 27 - Jun. 10 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Alison Riske | Win | 2-6, 6-1, 6-1 |
| Second Round | Taylor Townsend | Win | 6-3, 6-1 |
| Third Round | Andrea Petkovic | Win | 7-5, 6-0 |
| Fourth Round | Elise Mertens | Win | 6-2, 6-1 |
| Quarterfinals | Angelique Kerber | Win | 6-7 (2-7), 6-3, 6-2 |
| Semifinals | Garbine Muguruza | Win | 6-1, 6-4 |
| Final | Sloane Stephens | Win | 3-6, 6-4, 6-1 |
| Internazionali BNL d'Italia | ||
| Surface: Red Clay | Date: May 13 - May 20 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Naomi Osaka | Win | 6-1, 6-0 |
| Third Round | Madison Keys | Win | Retired |
| Quarterfinals | Caroline Garcia | Win | 6-2, 6-3 |
| Semifinals | Maria Sharapova | Win | 4-6, 6-1, 6-4 |
| Final | Elina Svitolina | Loss | 0-6, 4-6 |
| Mutua Madrid Open | ||
| Surface: Red Clay | Date: May 5 - May 13 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Ekaterina Makarova | Win | 6-1, 6-0 |
| Second Round | Elise Mertens | Win | 6-0, 6-3 |
| Third Round | Kristyna Pliskova | Win | 6-1, 6-4 |
| Quarterfinals | Karolina Pliskova | Loss | 4-6, 3-6 |
| Porsche Tennis Grand Prix | ||
| Surface: Clay | Date: Apr. 23 - Apr. 29 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Magdalena Rybarikova | Win | 4-6, 6-2, 6-3 |
| Quarterfinals | Coco Vandeweghe | Loss | 4-6, 1-6 |
| Miami Open presented by Itau | ||
| Surface: Hard | Date: Mar. 20 - Apr. 1 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Oceane Dodin | Win | 3-6, 6-3, 7-5 |
| Third Round | Agnieszka Radwanska | Loss | 6-3, 2-6, 3-6 |
| BNP Paribas Open | ||
| Surface: Hard | Date: Mar. 7 - Mar. 18 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Kristyna Pliskova | Win | 6-4, 6-4 |
| Third Round | Caroline Dolehide | Win | 1-6, 7-6 (7-3), 6-2 |
| Fourth Round | Qiang Wang | Win | 7-5, 6-1 |
| Quarterfinals | Petra Martic | Win | 6-4, 6-7 (5-7), 6-3 |
| Semifinals | Naomi Osaka | Loss | 3-6, 0-6 |
| Qatar Total Open | ||
| Surface: Hard | Date: Feb. 12 - Feb. 18 | Seed: 2 |
| Round | Opponent | W / L | Result |
| First Round | Bye | ||
| Second Round | Ekaterina Makarova | Win | 6-3, 6-0 |
| Third Round | Anastasija Sevastova | Win | 6-4, 6-3 |
| Quarterfinals | Catherine Bellis | Win | 6-0, 6-4 |
| Semifinals | Garbine Muguruza | Loss | Retired |
| Australian Open | ||
| Surface: Hard | Date: Jan. 15 - Jan. 28 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Destanee Aiava | Win | 7-6 (7-5), 6-1 |
| Second Round | Eugenie Bouchard | Win | 6-2, 6-2 |
| Third Round | Lauren Davis | Win | 4-6, 6-4, 15-13 |
| Fourth Round | Naomi Osaka | Win | 6-3, 6-2 |
| Quarterfinals | Karolina Pliskova | Win | 6-3, 6-2 |
| Semifinals | Angelique Kerber | Win | 6-3, 4-6, 9-7 |
| Final | Caroline Wozniacki | Loss | 6-7 (2-7), 6-3, 4-6 |
| Shenzhen Gemdale Open | ||
| Surface: Hard | Date: Dec. 31 - Jan. 6 | Seed: 1 |
| Round | Opponent | W / L | Result |
| First Round | Nicole Gibbs | Win | 6-4, 6-1 |
| Second Round | Ying-Ying Duan | Win | 3-6, 6-1, 6-2 |
| Quarterfinals | Aryna Sabalenka | Win | 6-2, 6-2 |
| Semifinals | Irina-Camelia Begu | Win | 6-1, 6-4 |
| Final | Katerina Siniakova | Win | 6-1, 2-6, 6-0 |
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