Pune-based 42-year-old Kirrtane of Railways ousted S D Prajwal Dev, while Vishwakarma prevailed over Maharashtra rival Shahbaaz Khan in the semi finals today.
Both Dev and Khan conceded their matches citing fatigue and dehydration.
Kirrtane belied his age as he won the first set 6-3 and lost the second 2-6 and trailed 2-3 in the third when Dev threw in the towel.
In the second semi final Vishwakarma was leading his rival 3-6 6-3 4-1 when Khan retired due to cramps.
Khan also moved up as third seed Ranjeet Virali Murugesan gave up when trailing 2-6 1-2.
Dev fought off a challenge from Kunal Anand, winning 7-6 6-2, while Vishwakarma edged out Jayesh Pungliya 0-6 6-3 6-1 to make it to the last four stage.
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