Mathews' fifty keeps South Africa toiling
Lunch Sri Lanka 237 for 4 (Mathews 53*, Roshen Silva 19*) & 338 lead South Africa 124 by 451 runs Angelo Mathews chops through point © AFP With the Test match headed only one way, Sri Lanka took the opportunity to stretch their lead and grind South Africa down before putting them in to bat a second time. South Africa will chase over 450, a target never successfully chased in…