Porto - Malaga
This is the first ever competitive meeting between Porto and Malaga.
Malaga are one of four teams unbeaten in the Champions League this season with Borussia Dotrmund, Juventus and Schalke.
Malaga have never trailed in a Champions League game so far this season.
Porto are unbeaten in their last seven Champions League games against Spanish opposition (three wins, four draws). Real Madrid are the last Spanish side to beat Porto in Europe's premier competition, in October 2003.
Porto have only ever lost one of their 11 Champions League games at home in the knockout stages (v Manchester Utd, April 2009).
Malaga have only lost one of their 24 games in European competition, qualifiers included. However, that defeat was in Porto against Boavista back in March 2003 (UEFA Cup quarter-finals).
Malaga's last three Champions League games have all ended in a draw.
Only PSG conceded fewer goals (3) than Porto (4) in the Champions League group stages this season.
Malaga are the only team yet to concede a first-half goal in the Champions League this season.
Joao Moutinho completed 310 passes in the opposition half in the group stages, only Xavi made more (551).
Jackson Martinez has scored three goals in his last four Champions League games for Porto.
Malaga goalkeeper Willy Caballero had the best saves-to-shots ratio in this season's group stages (86.4%) (over 90 mins played).
All three of Eliseu's goals in the Champions League this season have come away from home.
Arsenal - Bayern Munich
Arsenal and Bayern Munich have met four times before in the Champions League, with the Bavarians winning twice, Arsenal one and the other being a draw.
Their last encounter dates back to the 2004/05 Champions League last 16 when Bayern won 3-2 on aggregate.
Arsenal have won six of their last seven home Champions League games against German opposition, the only defeat coming against Schalke in this season's group stages.
Arsenal have only lost two of their 17 knockout games at home in the Champions League (v Chelsea in April 2004 & v Manchester Utd in May 2009).
Bayern Munich have lost on each of their last four trips to England in the Champions League. The Bavarians' last win in England dates back to April 2001 at Old Trafford in the Champions League quarter-finals.
Bayern Munich have scored in each of their last 12 Champions League games, the last team to stop them from netting being Basel in February 2012.
Arsenal had the fewest shots in this season's group stages among the 16 teams qualified for the knockout phase (47). However, they were the most efficient, scoring every 4.7 shots.
o Bayern Munich conceded the fewest shots on target in the group stages (17).
Bayern Munich had more shots on target from outside the box than any other team in the group stages (17).
Bayern Munich had the most goalscorers in this season's group stages (9).
Olivier Giroud has delivered four assists in the group stages of the Champions League this season, only Ibrahimovic has more (5).
Lukas Podolski has scored three goals from three shots on target in the Champions League this season.
Mario Gomez has scored 25 goals in 26 Champions League starts.
Galatasaray - Schalke
This is the first ever competitive meeting between Galatasaray and Schalke.
Schalke are one of four teams unbeaten in the Champions League this season with Borussia Dotrmund, Juventus and Malaga.
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.
Galatasaray have won their last three Champions League games. They have never won four on the bounce in the competition.
Galatasaray have won none of their last five home games against German opposition (two defeats, three draws).
Schalke are unbeaten against Turkish opposition (two wins, two draws).
Schalke's two away games in Turkey have both ended in a 3-3 scoreline, against Trabzonspor in October 1996 (UEFA Cup) and Fenerbahce in October 2005 (Champions League).
Galatasaray have scored only seven goals in six Champions League games this season, the joint-lowest among the 16 teams qualified for the knockout stages.
Galatasaray struck the woodwork more times than any other team in the group stages this season (6).
13 of the 17 goals scored by Galatasaray and Schalke combined in the group stages came in the second-half.
Burak Yilmaz scored six of Galatsaray's seven goals in the group stages this season. He was the joint-top scorer in the group phase with Cristiano Ronaldo.
Klaas-Jan Huntelaar has scored four goals in five starts in the Champions League this season.
Didier Drogba has scored 39 goals in the Champions League, only Lionel Messi (56) and Cristiano Ronaldo (44) have been more prolific among current players in the competition. He's netted seven goals and delivered two assists in his last nine CL games.
AC Milan - Barcelona
Barcelona are unbeaten in their last seven meetings with AC Milan, winning 4 and drawing 3.
This is their fifth encounter in the last two seasons of the Champions League.
AC Milan's last win against Barcelona dates back to October 2004 at the San Siro in the group stages of the Champions League (1-0).
Among the teams in the Champions League last 16, AC Milan are the only one who have yet to win at home in this season's competition. Their last home win the competition was a year ago, against Arsenal (4-0, 15 February 2012).
AC Milan have only scored one goal in their last four games at the San Siro in the Champions League. They have had 58 shots (incl. blocked) at home in the Champions League this season but only one of them has found the back of the net.
AC Milan have only won one of their last 10 knockout games in the Champions League, against Arsenal at home in the last 16 last season.
Barcelona have only lost two of their last 24 Champions League games, both in Britain (at Chelsea and Celtic).
Barcelona have the highest possession in the Champions League this season with an average of 75.8%.
No side picked up more bookings than AC Milan in the group stages this season (17).
Lionel Messi has scored 56 goals in 74 Champions League games, only Raul has scored more in the competition (71 goals in 142 games).
Three of the four players who completed the most passes in the opposition half during the group stages play for Barcelona: Xavi (551), Messi (303) and Iniesta (302).
