The 23-year-old Indian, who had clinched the Chinese Taipei Open last month, defeated 15th seed Antonsen 21-15 21-18 in a 39-minute clash in the USD 120,000 tournament here.
World No. 57 Sourabh, who reached the finals in his last three tournaments in Belgium, Poland and Chinese Taipei, will take on fourth seeded and World No. 16 Shi Yuqi in the summit clash.
Sourabh's younger brother and national champion Sameer Verma, seeded 12th, lost 18-21 15-21 to Shi Yuqi in another semifinal match.
Sourabh dished out a gritty performance as he fought back from 3-6 and 8-10 down to grab 14-12 lead. Antonsen clawed his way back immediately but the Indian ensured he had the advantage as he pocketed the first game.
In the second game, Sourabh opened up a 10-7 lead but the Denmark shuttler drew parity at 15-15 and then grabbed a 18-16 lead. But the Indian reeled off five points to seal the issue in his favour.
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