Youngest ATP Challenger winners

1. Michael Chang, 15 years 7 months, 1987 Las Vegas
2. Richard Gasquet, 16 years, 2002 Montauban
3. Bernard Tomic, 16 years 4 months, 2009 Melbourne
4. Kent Carlsson, 16 years 7 months, 1984 Neu-Ulm
5. Marcos Ondruska, 16 years 7 months, 1989 Durban
6. Rafael Nadal, 16 years 9 months, 2003 Barletta
7. Félix Auger-Aliassime, 16 years 10 months, 2017 Lyon
8. Novak Djokovic, 17 years, 2004 Budapest
9. Paul Dogger, 17 years, 1988 Porto
10. Juan Martín del Potro, 17 years 1 months, 2005 Montevideo

References

• Challenger Weekly Spotlight: 17-Year-Old Zverev Wins Maiden Title, 7 July 2014
• Auger-Aliassime makes history with Lyon Challenger title, 18 June 2017 (Wayback Machine)
• Challenger #NextGenATP First-Time Winner: Felix Auger-Aliassime, 18 June 2017 (Wayback Machine)
• Is Felix Auger-Aliassime Canada's newest tennis sensation?, 19 June 2017, (Wayback Machine)

Youngest ATP Challenger winners

1. Michael Chang, 15 years 7 months, 1987 Las Vegas
2. Richard Gasquet, 16 years, 2002 Montauban
3. Bernard Tomic, 16 years 4 months, 2009 Melbourne
4. Kent Carlsson, 16 years 7 months, 1984 Neu-Ulm
5. Marcos Ondruska, 16 years 7 months, 1989 Durban
6. Rafael Nadal, 16 years 9 months, 2003 Barletta
7. Félix Auger-Aliassime, 16 years 10 months, 2017 Lyon
8. Novak Djokovic, 17 years, 2004 Budapest
9. Paul Dogger, 17 years, 1988 Porto
10. Juan Martín del Potro, 17 years 1 months, 2005 Montevideo

References

• Challenger Weekly Spotlight: 17-Year-Old Zverev Wins Maiden Title, 7 July 2014
• Auger-Aliassime makes history with Lyon Challenger title, 18 June 2017 (Wayback Machine)
• Challenger #NextGenATP First-Time Winner: Felix Auger-Aliassime, 18 June 2017 (Wayback Machine)
• Is Felix Auger-Aliassime Canada's newest tennis sensation?, 19 June 2017, (Wayback Machine)