Cerundolo, 23, who broke into the Top 100 in February, now moves up nine places to a career-high 30 after winning in Bastad, Sweden.
France-born Cressy, 25, jumps eight places to 33rd after winning in Newport on Sunday. The leaders remain unchanged with Russian Daniil Medvedev on top ahead of Germany's Alexander Zverev and Spaniard Rafael Nadal.
Rankings 1. Daniil Medvedev (RUS) 7775 pts 2. Alexander Zverev (GER) 6850 3. Rafael Nadal (ESP) 6165 4. Stefanos Tsitsipas (GRE) 5045 5.
Casper Ruud (NOR) 4890 6. Carlos Alcaraz (ESP) 4845 7. Novak Djokovic (SRB) 4770 8. Andrey Rublev (RUS) 3540 9. Félix Auger-Aliassime (CAN) 3445 10.
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