Malaga - Porto
Porto are unbeaten in their last eight Champions League games against Spanish opposition (four wins, four draws). Real Madrid are the last Spanish side to beat Porto in Europe's premier competition, in October 2003.
Malaga have only lost two of their 25 games in European competition, qualifiers included. Both those defeats were in Porto: against Boavista back in March 2003 (UEFA Cup quarter-finals) and FC Porto in the first-leg.
Malaga are winless in their last four Champions League games, the longest current drought among the teams still left in the competition.
Malaga only had two shots in the first leg against Porto, the fewest attempts in a Champions League game this season.
Porto have conceded only four goals in seven games, the best defensive record in the Champions League this season alongside Juventus and PSG.
Porto have kept the most clean sheets in the Champions League this season (5).
Malaga are the only team yet to concede a first-half goal in the Champions League this season.
Porto last reached the quarter finals of the Champions League in 2008/09.
Porto have won none of their last six away games the Champions League knockout stages, their last win on the road dating back to the semi-finals in May 2004 against Deportivo La Coruna.
Bayern Munich - Arsenal
Bayern Munich are the top scorers in this season's Champions League (18 goals).
The only English team to beat Bayern Munich away from home in Europe (penalties excluded) are Norwich City, back in October 1993 (UEFA Cup).
Bayern Munich have won all three of their home games in the competition this season (12 goals, three conceded).
Bayern Munich have never lost by more than two clear goals at home in the Champions League.
Arsenal have only ever won once in Germany in the Champions League despite travelling there eight times. It was in September 2006 against Hamburg (2-1).
Arsenal have lost their two previous away games against Bayern Munich (one goal scored, four conceded).
Arsenal and Bayern Munich have met five times in the Champions League, with the Bavarians winning three times, Arsenal once and the other one ending in a draw.
Bayern Munich have scored in each of their last 13 Champions League games, the last team to stop them from netting being Basel in February 2012.
Arsenal have only kept one clean sheet in their last 23 Champions League games away from home.
Arsenal have the joint-worst defensive record among the 16 teams left in the Champions League this season (11 goals conceded, alongside Celtic).
Arsenal have had the fewest shots among the 16 teams left in the Champions League this season (57).
Bayern Munich have attempted the most crosses in the Champions League this season (217). All three of their goals in the first leg against Arsenal came from crosses.
Bayern Munich have had 10 different goalscorers in the Champions League this season, more than any other side.
Only Zlatan Ibrahimovic (5) has delivered more assists than Olivier Giroud and Philipp Lahm (4) in the Champions League this season.
Lukas Podolski has scored four goals from four shots on target in the Champions League this season.
Schalke - Galatasaray
Schalke are one of three teams unbeaten in the Champions League this season with Borussia Dotrmund and Juventus.
Galatasaray hadn't reached the knockout stages of the Champions League since 2000/01 when they were knocked out by Real Madrid in the quarter-finals.
Schalke have reached the knockout stages of the Champions League for the third time after 2007/08 and 2010/11. Both times, they made it at least to the quarter-finals.
Galatasaray are unbeaten in their last five Champions League games (three wins, two draws).
Galatasaray have won their last two away games in the Champions League (against Cluj and Braga).
Galatasaray have failed to keep a clean sheet in their last 11 away games in the Champions League.
Schalke are unbeaten against Turkish opposition (two wins, three draws).
Schalke have drawn the most games in this season's Champions League (4).
Schalke have never failed to score in the Champions League this season.
Galatasaray have scored only eight goals in seven Champions League games this season, the lowest among the 16 teams still left in the competition.
Burak Yilmaz has scored seven of Galatasaray's eight goals in the Champions League this season. He is the joint-top scorer in the competition with Cristiano Ronaldo.
Barcelona - AC Milan
The last time Barcelona exited the Champions League at the last 16 stage was in 2006/07. It was against Liverpool.
Barcelona have failed to score in their last two Champions League games for the first time since April 2008.
Barcelona have failed to keep a clean sheet in their last six knockout games in the Champions League at Camp Nou (four wins, two draws).
AC Milan's last victory against Barcelona at the Camp Nou in the Champions League was in September 2000 (2-0). Since then, they've had two draws and two defeats.
AC Milan have conceded at least three goals in four of their last six away games in the Champions League knockout stages.
AC Milan have failed to keep a clean sheet in their last eight away games in the Champions League.
AC Milan's last away win the Champions League knockout stages was against Bayern Munich in April 2007 (2-0).
Barcelona (5,447) have completed 3,251 more passes than AC Milan (2,196) in the Champions League this season.
AC Milan's last seven goals in the Champions League have all been in the second-half.
Lionel Messi only made one touch inside the opposition box in the first leg and didn't get a single shot on target.
Stephan El Shaarawy has been directly involved in four of Milan's last eight goals in the Champions League (two goals, two assists).
