Bangladesh were reeling on 177 for six on the slow R Premadasa track when Mushfiqur Rahim and Mehedi Hasan Miraz came to rebuild the innings.
The duo posted a crucial 84-run stand for the seventh wicket and push Bangladesh to 238 for eight after 50 overs.
The partnership was broken with Miraz falling to a catch against Nuwan Pradeep in the 46th over. Miraz made 43 off 49 with six boundaries.
2ND ODI
BANGLADESH INNINGS R B
Tamim b Udana 19 31
Soumya lbw b Pradeep 11 13
Mithun c Mendis b Dananjaya 12 23
Mushfiq not out 98 110
Mahmudullah b Dananjaya 6 18
Sabbir run out 11 19
Mosaddek c Kusal b Udana 13 27
Miraz c Karunaratne b Pradeep 43 49
Taijul run out 3 9
Mustafizur not out 2 2
Extras (b3 lb4, w12, nb1) 20
Total (50 overs) 238/8
Fall Of Wickets
1-26 (Soumya), 2-31 (Tamim), 3-52 (Mithun), 4-68 (Mahmudullah), 5-88 (Sabbir) 6-117 (Mosaddek), 7-201 (Miraz), 8-231(Taijul)
Bowling
De Silva 10-0-39-0 (w1), Pradeep 10-0-53-2(w1, nb1), Udana 10-0-58-2(w1) Kumara 10-0-42-0(w3), Dananjaya 10-0-39-2 (w2)
SRI LANKA INNINGS R B
Fernando c Tamim b Mustafizur 82 75
Karunaratne b Miraz 15 29
Kusal c Soumya b Mustafizur 30 34
Mendis not out 41 74
Mathews not out 52 57
Extras (b 4, lb 5, nb 1, w 12) 22
Total (44.4 Overs) 242/3
Fall Of Wickets
1-71 (Karunaratne), 2-129 (Fernando), 3-146 (Kusal)
Bowling
Miraz 10-0-51-1, Shafiul 5-0-29-0, Taijul 10-2-35-0, Mustafizur 8-0-50-2, Mosaddek 7-0-32-0, Sabbir 2.4-0-20-0, Soumya 2-0-16-0
Sri Lanka won by seven wickets
MoM: Avishka Fernando