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Namibia, who had impressed in the previous edition 12 months ago as well, recovered from 93 for six in the 15th over to post a challenging 163 for seven in 20 overs.
Jan Frylinck (44 off 28) and JJ Smit (31 not out off 16) did the damage in the death overs, sharing a whirlwind 69-run stand off 33 balls to raise concerns in the Sri Lankan dressing room.