Casemiro's first-half dismissal meant Ten Hag had to reassess his initial tactical plan against the Saints, but despite that, United went on to create some big chances in the second period.
David De Gea also made some huge saves at the other end, in the encounter, with honours even at the final whistle in M16.
Aaron Wan-Bissaka's landmark day, Casemiro's sending off and a gritty showing are among the topics we've picked out following our latest outing, that was full of talking points...
CENTURY UP FOR AARON
Aaron Wan-Bissaka reached 100 Premier League appearances for the Reds against the Saints, with the right-back returning to the starting XI, potentially as a reward for his strong second-half showing against Real Betis in midweek.