Portsmouth substitute Johnny Ertl cancelled out Sam Wood's strike as Wycombe remain unbeaten in six following a hard-fought 1-1 draw.Wood diverted a Peter Murphy shot past a stranded Paul Jones after 49 minutes to give the Chairboys the lead. But Ertl was on hand to volley a 70th minute Dan Butler corner high into the net past Matt Ingram to earn a well-deserved point. In a tight first-half, Paul Robinson cleared off the line from Murphy on 43 minutes after Jones had saved from Matt McClure. Seconds later Craig Westcarr should have put the home side in front but blazed a Jed Wallace cross over the bar. After Wood's opener, McClure fired horribly over with the score still at 1-0 and they would go on to rue the missed opportunity as Pompey marched back in the game. James Dunne rattled the crossbar with a 25-yard strike while Joe Devera and Westcarr wasted glorious chances by blazing high into the stands. After Ertl had saved the day with his first of the season, neither side could fashion a late winner.