Roelof van der Merwe finished unbeaten on 165, Somerset v Surrey, Royal London Cup, South Group, Taunton, April 28, 2017© Getty Images
Roelof van der Merwe and Dean Elgar added 213 to rescue Somerset from 22 for 5, Somerset v Surrey, Royal London Cup, South Group, Taunton, April 28, 2017© Getty Images
Roelof van der Merwe produced an astonishing hundred to rescue Somerset from 22 for 5, Somerset v Surrey, Royal London Cup, South Group, Taunton, April 28, 2017© Getty Images