A 1-0 home victory over Sporting in the second leg of a Champions League quarterfinal was a huge swing for Arsenal at the end of their week — an English club recovering from back-to-back elimination rounds in both domestic cups — said attacker Kai Havertz. Havertz scored the winning goal against Sporting in the tie, again as a substitute, which gave Arsenal an edge going into next week’s return leg in London. “A big turnaround for us for sure because we lost the