Greek 20-year-old Stefanos Tsitsipas broke into the world top 20 on Monday following his giant-killing run at the Toronto Masters.
The beaten finalist who lost out to world number one Rafael Nadal on Sunday vaulted into 15th place a day after his 20th birthday.
Tsitsipas, ranked 159th in the world one year ago, reached the final after eliminating four seeds along the way — Dominic Thiem, Novak Djokovic, Alexander Zverev and Kevin Anderson.
Halep strengthens here position
Simona Halep strengthened her position as women's world number one following her latest tournament triumph, according to the WTA rankings released Monday.
The 26-year-old from Romania leads her nearest rival, Caroline Wozniacki of Denmark, by a margin of more than 1,000 points following her win on Sunday in Montreal.
The French Open champion beat world number three Sloane Stephens 7-6 (8/6), 3-6, 6-4 in a gruelling 2hr 41min battle.
Latest ATP world rankings (men)
1. Rafael Nadal (ESP) 10220 pts
2. Roger Federer (SUI) 6480
3. Juan Martín Del Potro (ARG) 5410 (+1)
4. Alexander Zverev (GER) 4845 (-1)
5. Grigor Dimitrov (BUL) 4700
6. Kevin Anderson (RSA) 4535
7. Marin Cilic (CRO) 4085
8. Dominic Thiem (AUT) 3665
9. John Isner (USA) 3570
10. Novak Djokovic (SRB) 3445
11. David Goffin (BEL) 3085
12. Diego Schwartzman (ARG) 2380
13. Pablo Carreño (ESP) 2290
14. Fabio Fognini (ITA) 2145
15. Stefanos Tsitsipas (GRE) 2089 (+12)
16. Kyle Edmund (GBR) 1950
17. Lucas Pouille (FRA) 1870 (+1)
18. Nick Kyrgios (AUS) 1855 (-1)
19. Roberto Bautista (ESP) 1820 (-4)
20. Jack Sock (USA) 1815 (-1)
Latest WTA ranking:
1. Simona Halep (ROM) 8061 pts
2. Caroline Wozniacki (DEN) 6135
3. Sloane Stephens (USA) 5727
4. Angelique Kerber (GER) 5255
5. Caroline Garcia (FRA) 4680 (+1)
6. Petra Kvitová (CZE) 4550 (+2)
7. Elina Svitolina (UKR) 4470 (-2)
8. Karolína Plíšková (CZE) 4395 (+1)
9. Garbiñe Muguruza (ESP) 4345 (-2)
10. Julia Görges (GER) 3905
11. Jelena Ostapenko (LAT) 3787
12. Darya Kasatkina (RUS) 3525
13. Madison Keys (USA) 3127
14. Elise Mertens (BEL) 2960 (+1)
15. Venus Williams (USA) 2901 (-1)
16. Ashleigh Barty (AUS) 2770
17. Kiki Bertens (NED) 2420 (+1)
18. Anastasija Sevastova (LAT) 2250 (+1)
19. Naomi Osaka (JPN) 2245 (-2)
20. Mihaela Buzarnescu (ROU) 2068
