Yuki had crashed out in the first round of the French Open but made quarterfinals at the Surbiton Challenger to gain 30 points from the two events.
The left-handed Prajnesh, who missed out on playing his maiden Grand Slam as 'lucky loser' at Roland Garros, has had a good first half of the season, winning his maiden singles Challenger trophy apart from an ITF Futures title.
The 28-year-old has also qualified for his maiden ATP World Tour event in Stuttgart.
Ramkumar Ramanathan lost seven places to be 128 and young Sumit Nagal dropped to 234 after losing 14 places.
Arjun Kadhe was the next best Indian at number 360.
Vishnu Vardhan broke into the doubles top-100 for the first time in his career after gaining two places to get to 99.
In the WTA rankings, Ankita Raina continued to be India's number one player at 203 (+5) and was followed by Karman Kaur Thandi (262, +2), Pranjala Yadlapalli (393, +32) and Rutuja Bhosale (403, -3).
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