By Grey Whitebloom A rueful Mauricio Pochettino fretted over Chelsea’s squandered opportunities after a “painful” defeat to Liverpool in Sunday’s Carabao Cup final. The Blues carved open five of what Opta define as ‘big chances’ – i.e. “a situation where a player should reasonably be expected to score” – but were thwarted by Liverpool’s second-choice goalkeeper, Caoimhin Kelleher when they didn’t miss the target. Pochettino counted even more. “We created four, five, six big chances and we didn’t score,” the visibly deflated coach sighed when speaking to Sky Sports after losing Sunday’s final t…