His policy might be to buy cheap and sell as profitably as you can. Wigan does that on a global scale. The best winger currently in English soccer is Antonio Valencia, an Ecuadorean imported by Wigan and sold to Manchester United in 2009 for about £16 million, or $26 million at current rates.

In place of Valencia, and others sold by the club, Martínez coaxes bargain-basement players. His match winner Saturday was Victor Moses, a striker who played for English national teams from age 15 to his present age, 21, but who recently chose to represent Nigeria where he was born.

When inspiration strikes Moses, he can be devilishly hard to defend against. His feet are swift, his mind imaginative. His leap Saturday was timed to outwit much taller defenders to head the opening goal.

It was the making of that goal that so impressed. Shaun Maloney, a left winger born in Malaysia and raised in Scotland, started the move with a visionary cross-field pass into the stride of Emmerson Boyce, a Barbadian wing-back. Boyce, nominally a right back, sprinted into attack, outpaced Newcastle’s Italian defender Davide Santon as if the opponent were standing still and used his left foot to curl in a cross for Moses.

The fluidity of that move pleased the man on the sideline in the immaculate suit, coach Martínez.

With an early lead, most teams in the Premiership would regroup and defend. Wigan is not built to do that. The Wigan of Martínez — who by the way was a decent but not an exceptional player — goes for more.

More came, and swiftly. Within two minutes, Moses poached a second goal, then Maloney scored the third, and Franco Di Santo, a tall Argentine striker, volleyed an exquisite fourth.

At halftime, Newcastle changed tactics to square up to Wigan’s approach, and turned a rout back into a contest. Newcastle’s Papiss Cissé, who has scored in each of his previous six Premier League games, twice hit the goal frame.