Olufunke Oshonaike ( NGR ) went the distance to beat Mariana Sahakian ( LIB ) 4 - 3 .
Brazil 's Caroline Kumahara staved off Australia 's Melissa Tapper 4 games to 2 .
Olufunke Oshonaike ( NGR ) went the distance to beat Mariana Sahakian ( LIB ) 4 - 3 , and Brazil 's Caroline Kumahara staved off Australia 's Melissa Tapper 4 games to 2 .