The Lions overcame South African rivals Stormers 41-22 in an exhilarating Super Rugby clash in Johannesburg.
Lyon booked a Top 14 semi-final against Clermont after a hard-fought 21-16 victory over Montpellier on Saturday.
Exeter Chiefs led by 11 points midway through the second half, but Saracens produced a comeback worthy of champions to win the double.
The Crusaders were 20-0 up midway through the first half, but the Chiefs rolled up their sleeves to pull off an unlikely victory.
La Rochelle finished behind Racing 92 in the Top 14 regular season but dumped the Paris club out of the play-offs on Friday.
The Blues looked set to claim a dramatic Super Rugby win over the Bulls, but Harry Plummer failed to convert a late penalty.
Springboks playmaker Elton Jantjies will miss the Lions' Super Rugby meeting with the Stormers due to a "breach of team protocol".
The Brumbies have been dealt another blow, with confirmation that Henry Speight will leave the club to join the Reds at the end of...
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Geordan Murphy's abuse of officials has landed the Leicester Tigers coach a three-match ban.
Ireland's most decorated player, Rob Kearney, is sure of playing his 15th professional season in his home country.
Australia veteran David Pocock, 31, has played his last game for the Brumbies as he eyes September's Rugby World Cup in Japan.
Sean O'Brien, who will join London Irish later this year, is to miss the Rugby World Cup for Ireland with a hip injury.
Leinster failed to read the script as Stuart Hogg's final Glasgow Warriors match ended in a painful Pro14 final defeat.
The Blues have now suffered 10 consecutive losses to the Crusaders after Super Rugby's leaders edged a tense Christchurch encounter.
There will be a new Top 14 champion after Castres missed out on a top-six finish with a final-day defeat to Toulon.
Will Genia's head injury was the only disappointment for the Rebels as they thrashed the rock-bottom Sunwolves in Tokyo on Saturday.