If we don’t trust Sri Lanka to expose this frailty, then let’s find another way to take advantage. Jonny Bairstow is 12/1 to top-score in England’s first innings this week, and that’s worth some small change.Batting at seven need not scupper his chances here if early wickets fall, and in his current form and on his home ground he should feel as confident as anyone.Bairstow has batted twice at Headingley this summer. He made 246 off 270 balls against Hampshire, and then 198 from 231 against Surrey.Clearly Test cricket is a step up, but there are few terrors in the Sri Lanka attack and Bairstow should be feeling settled in the side after the winter. The rate he is scoring his runs means he doesn’t necessarily need the bowlers to hang around a long time if it comes down to it.There’s always a risk when backing someone down the order that you’ll get no run for your money, but given Bairstow’s form and the doubts over England’s top five, that risk is more than built into the price.Returning to Sri Lanka’s batting frailties, and their top series batsman betting looks to be a three-way tussle. Over the last 12 months, onlyAngelo Mathew s, Dinesh Chandimal and Dimuth Karunaratne have posted any serious runs. Mathews with 822 leads Chandimal by a single run, with Karunaratne a touch further back on 736.Karunaratne is the outsider of the three and tempting at 6/1, but I’d rather side with the experienced skipper Mathews at 7/2. In the last two years, the now-retired Sangakkara is the only Sri Lankan within 600 runs of Mathews’ tally of 1707 Test runs.He scored 306 runs in the two Tests here last time out, recording a century and three 50s in four innings. Experience of English conditions is a huge positive against what remains a stellar England pace attack led by Stuart Broad and James Anderson. With the top order taken to struggle against the moving ball, the path is clear for Mathews to take out this market from the middle order.