Edition: Singapore Indonesia Asia US/UK World number one Aryna Sabalenka showed nerves of steel and champion's resolve to defeat Elena Rybakina 7-6(6) 3-6 7-6(6) in their Berlin Open quarter-final on Friday, saving four match points in the final-set tiebreak. Rybakina had led 6-2 in the deciding breaker and appeared on the brink of securing a place in the semis but after she was denied victory on her first match point by a net cord, the momentum swung in Sabalenka's favour. The Belarusian