GQEBERHA – Ryan Rickelton made a battling century as South Africa overcame a shaky start on the first day of the second Test against Sri Lanka at St George’s Park on Thursday.The left-handed Rickelton hit 101 as South Africa reached 269 for seven at the close.Rickelton, 28, has been a peripheral figure in the South African Test team since making his debut two-and-a-half years ago. He was playing in only his eighth Test out of a possible 19 and came into the match with a highest score of 42.”It’s a lot of relief more than anything,” said Rickelton. “I take a lot of pride in my cricket and…