"His was a daring Snitch capture that involved a breakneck dash through the cross fire of both Bludgers and risked collision with [Chaser Willi Wenzel]"
-- match report USA v Liechtenstein, Daily Prophet, 8 June 2014 (Pm)
A close-fought match against Jamaica ended when the opposing Keeper collapsed and fell from her broom, just as Smackhammer was racing their Seeker to the Snitch. The United States then won against Liechtenstein by 450 points to 290, after his spectacular Snitch capture (Pm).
The team lost in the semi-finals to Brazil, at the end of a two-day match. Smackhammer was prevented from earlier catching the Snitch by two precision-hit Bludgers from the Brazilian Beaters. He then lost a thrilling break-neck race for the Snitch against Brazilian Seeker Tony Silva (Pm).
The Americans last match of the tournament was the playoff for third place, which they lost by 330 points to 120 to the Japanese National Team. Japan's Seeker caught the Snitch while Smackhammer was caught in a broom-lock with his own Beater, Lucas Picquery. The subsequent fourth place overall finish was a still considered to be good result (Pm).
Other canon notes and references
Darius is a Roman name, from the Greek Δαρειος (Dareios), which itself is a form of the Persian name Dārayavahush, meaning dâraya "to possess" and vahu "good" (Behind the Name).
Smackhammer is probably a compound of smack ("a slap or blow") and hammer ("a tool with a heavy metal head") (Oxford English Dictionaries).
As he is from the USA, Smackhammer could have attended the Ilvermorny School of Witchcraft and Wizardry.
From the Web
Screenshots of the Daily Prophet's coverage of the 2014 Quidditch World Cup: http://imgur.com/a/AXutv