Middlesex suffered a defeat in the final game of their 2013 cricketing summer after Yorkshire secured an 80 run victory on day four of the LV= County Championship clash at Headingley.
The Panthers started the day well be by taking Yorkshire's remaining five wickets for just 64 runs, as they bowled the hosts our for 194.
Youngster Tom Helm impressed, taking 3/46 from his nine overs, which included the wickets of Tykes skipper Andrew Gale (40) and in-form Gary Ballance (90).
Set 277 for victory, Middlesex started poorly as Sam Robson - who has a had a fine season with the bat for the county - was caught off the bowling of Steven Patterson for just 3.
Captain Chris Rogers completed a typically determined half century as he hit 65 from 85 balls. But the Australian was offered little support as Middlesex were all out for 196 in their second innings.
Jack Brooks was the pick of the Yorkshire bowlers. The 29 year-old finished with figures of 4/33 from his 7.5 overs.
With one round of County matches still to go, Middlesex have a strong chance of finishing third behind winners Durham and second-placed Yorkshire.
But both Sussex and Warwickshire could overtake the London side.
However, with the Sussex facing newly crowned champions Durham and Warwickshire travelling to Derbyshire - who will be fighting for their Division One status - Angus Fraser's side are in a great position to complete another third-placed finish in the top flight of English cricket, having achieved the same feat last season following their promotion back to Division One.