Tuesday sees two very finely poised games in the Champions League round of 16 as Manchester United host Atletico Madrid and Benfica travel to Amsterdam to face Ajax.
A 1-1 draw at the Wanda Metropolitano three weeks ago felt harsh on Atletico, and Diego Simeone will not have been too pleased to see Cristiano Ronaldo roar back into form at the weekend with a hat-trick in United's 3-2 win against Tottenham.
An exciting first leg in Lisbon saw Benfica and Ajax play out a 2-2 draw, with the Dutch side's star striker Sebastien Haller finding the net at both ends.
The removal of the away goals rule means there is not a single thing separating these sides heading into the second legs, so here are some Opta facts to help you decide who you think will come out on top on Tuesday.
Manchester United v Atletico Madrid
Ronaldo was back to his effervescent best on Saturday, and has scored in both of his Champions League home games for Ralf Rangnick's men this season. If he does so again, it would be only the second time he has managed three in a row for the club (previously between November 2007 and March 2008).
He has netted 13 goals in his last 15 home games against Atletico across all competitions, including two hat-tricks in his most recent four (for Real Madrid in May 2017 and Juventus in March 2019, both in this competition).
United have been eliminated from their last three Champions League knockout stage games when drawing the first leg, doing so against Real Madrid (2012-13 last 16), Bayern Munich (2013-14 quarter-final) and Sevilla (2017-18 last 16).
However, when failing to win the first leg of a Champions League knockout tie at home, Atletico have been eliminated three out of four times. The only exception was a 3-1 win at Chelsea in the 2013-14 semi-final, following a 0-0 draw in the home leg.
Before this season, 69 per cent of teams to draw the first leg of a Champions League knockout stage tie at home have been eliminated (59/85). That being said, six of the last 10 such teams to progress have done so against English sides.
Atletico have lost their last two away trips to face English sides in the Champions League, losing at Chelsea in 2020-21 and Liverpool this season without scoring a goal in either. In addition, they have not kept a clean sheet in any of their eight total away games against English teams in the competition, conceding 14 goals overall.
The Red Devils have only won two of their last eight Champions League home games when hosting Spanish opposition (D3 L3), although the most recent of those did come earlier in the competition this season, beating Villarreal 2-1 with a stoppage-time winner from Ronaldo.
Despite the reputation of Simeone's side for being tight at the back, they have not kept a clean sheet in any of their last six Champions League matches – only between September 2009 and October 2013 (seven games) have they had a longer such run in the competition.
Ajax v Benfica
Ajax lost their first ever home game against a Portuguese opponent in the European Cup/UEFA Champions League (3-1 in February 1969 v Benfica) but have since gone unbeaten in five matches since (W4 D1). They have won all three encounters that have taken place in the Champions League era, including one earlier this season (4-2 win v Sporting CP in the group stage).
Including qualifiers, Benfica have only won one of their last 10 away games against Dutch sides in European competition – 1-0 v AZ in the Europa League in 2013-14. Six of the other nine games have ended in draws (L3), including one earlier this season against PSV in Champions League qualifying (0-0).
Ajax have won all three of their home games in the Champions League this season. They will be looking to win four in a row on home soil in the competition for the first time since March 1996, when they won seven in succession under Louis van Gaal.
Benfica are looking to progress beyond the last 16 of the Champions League for the first time since 2015-16, when they beat Zenit. It would be just the fourth time they have reached the quarter-finals of the competition in the 21st century, after doing so in 2005-06, 2011-12 and 2015-16.
Goal enthusiasts Ajax have scored at least twice in all seven of their Champions League games this season, netting 22 times in total. That is the most by team from outside of the big five European leagues through their first seven games of a campaign since Ajax themselves, who scored 30 in 1979-80.
Benfica have only won one of their last 14 away games in the Champions League (D4 L9), which was against AEK Athens in October 2018. In the knockout stages of the competition, Nelson Verissimo's side have lost five of their last six away games (W1).
Ajax have four different players in double figures for chances created from open play in the Champions League this season – Dusan Tadic (16), Haller (13), Steven Berghuis (12) and Antony (10). Only Manchester City have had as many different players do so (also four).
Haller has been directly involved in five goals in three home appearances in the Champions League this season (three goals, two assists), and could become just the fourth player in the competition's history to score in each of his first four home appearances, after Oscar (2013), Frederic Kanoute (2008) and Alessandro Del Piero (1996).