Four knockout round berths remain up for grabs in the East Zone while just one spot is still available in the West. Ahead of the final set of group stagefixtures, the-AFC.com has chosen five things to look out for.

A clash between two of the most in-form teams in East Asia is set to bring a worthy conclusion to Group H when K-League table-toppers Ulsan are hosted by China PR's second-placed side Shanghai SIPG.

The hosts are currently on a 10-match unbeaten run across all competitions, with their last defeat coming on April 5 against Chongqing Lifan. They have only suffered one loss on the Continent this campaign, too, although that was against Tuesday's opponents Ulsan.

Their target is clear: a win over their Korean visitors and they will guarantee qualification to the Round of 16. A draw or even a defeat would be enough should Kawasaki Frontale fail to win away at Sydney FC, but the team will surely wish to avoid such a nervous conclusion to the match at Shanghai Stadium.

Already eliminated from the 2019 AFC Champions League, but winners of the Grand Final against Perth Glory on Sunday, it has been a rollercoaster few months for Australia's Sydney FC.

It will surely be a party atmosphere at Jubilee Stadium when the Sky Blues take to the field to celebrate their domestic title in front of their home fans, but there is also the matter of the final Group H tie of the 2019 campaign against visitors Kawaski.

The J.League side will be out spoil the festivites and hope they are the ones receiving the adulation of their supporters after securing a place in the Round of 16.

With the sides currently locked on seven points apiece in Group G, Urawa sit just above Beijing by virtue of goal difference and would advance with a win or a goalless draw, after the first meeting between the pair ended 0-0 on Matchday Two.

But, in a group that looks likely to be decided by fine margins, the visitors would seal the second qualification berth – behind group winners Jeonbuk Hyundai Motors – should they manage a score draw or better in Japan.

Two-time champions Jeonbuk have already confirmed their place in the last 16 as group winners while Buriram’s chances of reaching the knockout rounds were ended following a 2-1 defeat to Urawa Red Diamonds two weeks ago.

But hosts Jeonbuk, who beat Beijing FC 1-0 a fortnight ago to seal their progression and have won four of their five games, will be looking for revenge after suffering a 1-0 defeat in Buriram on Matchday Two.

With Al Sadd having already booked their ticket to the knock-out stage from Group D, Pakhtakor travel to Jeddah for what is essentially a cup tie against 2012 runners-up Al Ahli.

The Uzbek side sit second in the standings on eight points. A 1-0 victory over Persepolis in the previous matchday eliminated the Iranians from the competition, leaving Pakhtakor in need of one point in Saudi Arabia.

The former Barcelona midfielder brings to an end a four-year stay in Doha as he prepares to hang his boots following the Persepolis clash, closing the curtains on the final act of a 22-year career which saw him win 32 titles, the last of which was the 2018-19 Qatar Stars League.

In Tehran, a repeat of the 2018 AFC Champions League semi-final between Persepolis and Al Sadd comes under contrasting circumstances, with Al Sadd already qualified and Persepolis eliminated from Group D.

On Monday, the two sides meet for the sixth time in just over a year. Persepolis and Al Sadd were pitted together in Group C last time around. A brace from Baghdad Bounedjah helped Al Sadd to a 3-1 win in Doha on Matchday Two.