| SINNER | The current world number one in men's singles tennis (6,6) |
| JANNIK | The current world number one in men's singles tennis (6,6) |
| NADAL | Who is the current world number one in men's tennis? (5) |
| TRUMP | Judd _, Bristol snooker player who is the current World Number One (5) |
| NORRIE | British tennis player and the current British No. 1 in men's singles, Cameron _ (6) |
| CARLOSMOYA | 1998 French Open tennis champion who briefly replaced Pete Sampras as world number one in 1999 (6,4) |
| HEWITT | Alcaraz broke his record to become the youngest No. 1 in men's tennis history. (6) |
| MARGARETCOURT | Former World number one tennis player with 11 Women's Singles titles in the tournament mentioned in 17a: 2 wds. |
| ROYEMERSON | Former World number one tennis player with 6 Men's Singles titles in the tournament mentioned in 17a: 2 wds. |
| ROGER | ___ Federer former World number one tennis player with 6 Men's Singles titles in the tournament mentioned in 17a |
| SABALENKA | Aryna _, Belarusian tennis player and the current world No. 1 in singles (9) |
| COCHET | Henri ___, former world number one tennis player who was one of the "Four Musketeers" of French tennis |
| ALFIE | English wheelchair tennis player; the current world No. 1 in both singles and doubles, _ Hewett (5) |
| NIEKERK | Wayde van ---, South African sprinter; the current world record holder in the 400m (7) |
| RIOS | Marcelo ___, Chilean tennis player who held the World number one ranking for six weeks in 1998 |
| EVERT | Former world number one tennis player nicknamed the "Ice Maiden" (5) |
| PETERNICOL | The first British squash player to hold the World number one ranking |
| BORG | One-time world number one tennis professional, Bjorn _ (4) |
| FARAH | Who is the current world and Olympic champion in the 5,000m and 10,000m? (5) |
| ALEKNA | Lithuanian athlete who is the current world record holder in the discus throw, Mykolas _ (6) |
