“I feel disappointment, bitterness, and responsibility,” Iga Swiatek admitted after her second-round exit at the Miami Open back in March. Not long after, she parted ways with coach Wim Fissette, with a difficult start to the season seemingly playing a big role in that decision. Early exits, a dip in form, and a struggle to find her usual rhythm had left the Pole searching for answers. That search led her to bring Rafael Nadal’s ex-coach Francis…