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Justin Herbert 's a top-tier NFL quarterback, but he actually showed off his defensive skills Friday night -- fending off a basketball headed right for his GF Madison Beers at the Lakers game!

The Chargers QB and his pop star girlfriend watched the Lakers take on the Minnesota Timberwolves from a pair of courtside seats at Crypto.com Arena ... when a ball came off the court straight at them. Getty

While Madison cowered away from the ball, her man leaped into action ... throwing out a hand like a defensive back breaking up a pass to a wide receiver and swatting the ball away. Getty

While Beer clearly isn't going to the WNBA anytime soon, she did look great in a revealing black tank top while she sat next to her man ... fresh off his team's

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