US-based Thomas Frazer of St Malachy's ran a personal best 2 hrs 18 mins 37 secs at the Chicago Marathon. Last month, Frazer won the Chicago Half Marathon in 67:12.
Frazer's previous best for the marathon was 2:19.42 and, earlier this year, he ran 2:19.58 in Rotterdam.
Also abroad, Paul Pollock, who makes his marathon debut in Dublin, clocked a time of 65 mins 38 mins for 34th place at the World Half Marathon Championships in Bulgaria.
At the Boston Half Marathon, Alistair Cragg finished fifth in 64 mins 10 secs.
A pair of Raheny Simons finished first and third at Simon 5-Mile Fun run in Dublin's Phoenix Park. Simon Ryan led home an entry of 1,987 in a time of 25 mins 22 secs and was comfortably clear of Gary Hynes.
His Raheny clubmate Simon Reede finished third. Hannah Brooks was first woman in 27.58, chased home by Moynalvy's Sarah Treacy.
Kelly and Dunleavy Sligo stars
Elish Kelly of Raheny Shamrock ran 36 mins 18 secs to finish first woman and sixth overall at the Grange 10km in Sligo, where Sligo's Emmett Dunleavy was the men's winner in 31 mins 50 secs.
Breege Connolly of North Belfast Harriers and Marathon Mission won the RunHer 10km at Stormont in an untroubled 37 mins 26 secs.
Minnock plan comes together
Barry Minnock, of Rathfarnham WSAF, not only organised the Athlone 3/4 Marathon, but won it! His time of 1 hr 47 mins 7 secs put him 49 seconds ahead of Gary O'Hanlon of Clonliffe, last year's winner.
Mary Laverty of North East Runners was first woman in 2:14.36.
A day earlier, O'Hanlon had finished fifth behind his Clonliffe clubmate Sergiu Ciobanu at the Galway Bay Half Marathon.
Bralitis blasts to victory in '15'
Sandis Bralitis of West Waterford had a good win at the Cork to Cobh "15", with his time of 79 mins 31 secs giving him a three-minute margin over his clubmate Raivis Zakis.
Claire Gibbons-MacCarthy was an equally emphatic winner of the women's race.
St Barry's battle on right road
GAA clubs organising road races are taking a bit of stick these days, but some deserve credit. High on the list of best small races in the country is the Tarmonbarry Half Marathon in Co Roscommon, organised by St Barry's GAA Club and taking place for a 29th year on Sunday.
With a nice course on quiet country roads, legendary post-race refreshments and a reasonable entry fee of €30, this race has rightfully gained a loyal following among athletics club members.