In fact, the top three speeds all came from drivers in Group A with*Hamlin leading the way with an average lap speed of 93.928 mph.Corey Lajoie ended up second-fastest (93.747 mph) and playoff contender William Byron was third (93.696 mph).Hamlin’s Joe Gibbs Racing teammate, Martin Truex Jr., who also needs a good run Sunday to advance to the Championship was fastest in Group B at 92.973 ...<a class='more' href='https://www.motorsport.com/nascar-cup/news/hamlin-tops-the-speed-charts-in-martinsville-cup-practice/10539459/?utm_source=RSS&utm_medium=referral&utm_campaign=R SS-NASCAR&utm_term=News&utm_content=www'>Keep reading</a>

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