The fledgling partnership had 5 match factors in an epic deciding tie-break however ended up shedding it 18-16.
O’Mara and Barnett lastly transformed their fifth match level to seal a 3-6 6-4 7-6 (16) victory in two hours and 12 minutes.
Jamie Murray and Venus Williams are out of the Wimbledon blended doubles after shedding a marathon second-round encounter to Britain’s Jonny O’Mara and Alicia Barnett.
The defeat means Scot Murray and American Williams didn’t handle to emulate siblings Andy and Serena, who reached the third spherical once they teamed up in 2019.
Williams, 42, had not performed competitively since final August however requested a wild card to look on the Championships for a twenty fourth 12 months.