By Frankie Taddeo The Ravens are sizable home favorites against the Browns in Week 7. Lamar Jackson and the Ravens have not been able to finish games. After blowing double-digit leads in losses to the Dolphins and Bills earlier in the year, Baltimore lost its third game this season when leading heading into the fourth quarter.in Week 6 in its 24-20 loss to the Giants. Jackson turned the ball over on the final two drives of the game and the Ravens squandered a 20-10 lead. The Browns joined the Ravens as one of six betting favorites to be upset Sunday when they lost to the Patriots in Foxboro. C…