German Alexander Zverev rose one spot to a career high seventh in the ATP rankings released on Monday following his victory at the Rogers Cup in Montreal.
The 20-year-old stunned Swiss great Roger Federer 6-3, 6-4 in Sunday's final to win his second Masters 1000 title of the year, having beaten Novak Djokovic in the Rome title clash in May.
Zverez: "Beating the greatest player of all time is amazing"
"This one against Roger is something so special for me because he was always a great idol growing up for me," Zverev said during his trophy presentation. "The greatest player of all time, beating him in a final, not just any final but in the final of a Masters 1000, is amazing."
The win improved Zverev to 5-1 in finals this year with the only defeat coming at the hands of Federer at Halle.
The biggest mover, though, was 18-year-old Canadian Denis Shapovalov, who climbed 76 places to 67th after reaching the semi-finals in Montreal, beating world number two Rafael Nadal along the way.
Briton Andy Murray retained the No.1 spot but will lose it to either Nadal or Federer at the end of the week.
Murray is injured and will sit out the Cincinnati Masters, where he reached the final last year.
ATP Rankings top 10
1. Andy Murray (GBR) 7,750pts
2. Rafael Nadal (ESP) 7,555
3. Roger Federer (SUI) 7,145
4. Stan Wawrinka (SUI) 5,780
5. Novak Djokovic (SRB) 5,325
6. Marin Cilic (CRO) 5,155
7. Alexander Zverev (GER) 4,470 (+1)
8. Dominic Thiem (AUT) 4,030 (-1)
9. Kei Nishikori (JPN) 3,285
10. Milos Raonic (CAN) 3,230