Saracens pounced on a terrible blunder by the Ospreys to clinch a 35-20 victory at StoneX Stadium that secured their place in the Heineken Champions Cup quarter-finals.

With a desperately-tight round-of-16 tie locked at 20-20 approaching the final 10 minutes, Rhys Webb took a quick line-out around his 22 only for the ball to fall straight into the arms of Duncan Taylor.

It was Taylor’s first touch of the afternoon having just arrived as replacement for Alex Lozowksi and the former Scotland centre strolled over before being mobbed by his team-mates.

League form pointed to a comfortable home win with Saracens leading the Premiership and Ospreys sat 12th in the United Rugby Championship, but the only Welsh side left in the knockout phase instead went toe-to-toe in a pulsating clash.

They lost wing George North shortly before kick-off but still paraded nine internationals and it was not until Max Malins claimed the second of his two tries in the 57th minute that Saracens were back in the hunt.

It was a far-from-vintage display from the three-time European champions but they had the resilience to set up a last appointment with La Rochelle next weekend, becoming the third English club behind Leicester and Exeter to reach that stage.

Tom Woolstencroft’s late try distorted the final scoreline, which from an early stage, seemed beyond Mark McCall’s men.

An Owen Farrell penalty rewarded Saracens’ early dominance but two tackle-busting carries by centre Kieran Williams punched holes in their defence with full-back Mike Collins crossing to round off the second.

Having seen their try-line breached, the hosts stepped up a gear with a driving maul held up over the line before quick ruck speed and hard running created a chance on the left with only the killer instinct missing.

But in classic rope-a-dope fashion, the Ospreys soaked up the pressure and then pounced on a mistake, Webb grabbing the ball as it squirted out of Nick Tompkins’ hands and launching a move that ended with Kieran Williams touching down.

Nicky Smith and Justin Tipuric were also involved in a superb try and shortly after, only robust defence prevented Saracens’ line from cracking a third time.

Three points from Farrell rounded off a brief siege on the visitors’ whitewash and another key moment arrived when the excellent Kieran Williams was shown a yellow card for killing the ball as he halted a dynamic break by Ben Earl.

Malins crossed in first-half overtime to continue the momentum shift, although it was uncertain whether he had properly grounded the ball.

Owen Williams rifled over a penalty to open a four-point lead for the Ospreys and the contrasting fortunes of the Vunipola brothers were on full display as Billy knocked on twice, while Mako made two impactful charges downfield.

Smith continued the theme of props making bullocking runs into space but the attack ran out of steam and in the 57th minute Saracens found their ruthless streak as Alex Goode chipped ahead for Andy Christie to send Malins over.

For the first time since the 10th minute Saracens took the lead through a Farrell penalty and when Taylor punished Webb’s moment of madness, it was all over.

In Sunday’s other Champions Cup last-16 clash, Toulouse turned on the style in the second half to beat Bulls 33-9.

Tries from Emmanuel Meafou, Matthis Lebel and Thibaud Flament, all after the break and all converted by Thomas Ramos, took the game away from the South Africans after a cagey first half.

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