Liverpool put themselves well into the ascendency of their Champions League tie with Porto after their 2-0 win at Anfield last week.
The Reds eased to victory, with their goals coming from Naby Keita and Sadio Mane.
But the game was not as cut and dry as some might think. Porto had a couple of very good chances of their own, and on another day, the score could have been a lot different.
Porto are a tough side, and they are hard to beat for any team. If the Portuguese outfit grab an early goal, it could potentially be very edgy for Liverpool.
The Premier League leaders must keep in mind that if they score one goal, Porto will have to score four, making an already uphill task near on impossible.
But here we will take a look at some of the key battles going into this game, which will decide who makes it into the Champions League semi-finals.
