Defending Super League champions Wigan Warriors will face St Helens for a place in the grand final after beating Salford Red Devils 18-12.
Manly Sea Eagles' superb 2019 season came to an end as they were narrowly beaten by South Sydney Rabbitohs in a thriller at ANZ Stadium
The NRL approved a return for former Cronulla Sharks head coach Shane Flanagan.
Tries from Adam Milner and Jordan Rankin helped Castleford Tigers to victory on the road in a hard-fought elimination final.
Former New Zealand international Shaun Kenny-Dowall is heading for Super League after signing for Hull Kingston Rovers.
After painful defeats last week, Melbourne Storm and South Sydney Rabbitohs will hope to bounce back in the NRL semi-finals.
Brisbane Broncos' season ended with a whimper at Bankwest Stadium, where Parramatta Eels ran in an astonishing 11 tries to stay alive.
Melbourne Storm were left shell-shocked after John Bateman's late try put Canberra Raiders a victory away from the NRL Grand Final.
Joseph Leilua was unable to start the NRL Finals showdown at AAMI Park due to damage done by pre-game pyrotechnics.