But the difference I see between these two teams is that Sri Lanka's win is pretty much assured as they are playing at home.
Sri Lanka team won the toss and decided to bat which is a good decision for Sri Lankan team, Test match is usually a long game where strategy should be used. And Pathum Nishanka, Dimuth Karunaratne entered the field as the opening batsmen of the Sri Lankan team but could not build their batting partnership. As the opening two batsmen got out after collecting only a few, the Sri Lankan players did not perform well on their own ground.
Thus, if the Test match continues to lose wickets, then there is a possibility of an all-out in the first innings, as the two experienced batsmen of the Sri Lankan team were dismissed early on, leaving the team under a lot of pressure. If they can't perform well at their home ground then they won't be able to win the first and first match. If the Sri Lankan team players are weak in terms of batting from the beginning then the chances of performing well later on will be very low.