Adelaide began its weekend on Thursday night with a win in Auckland over New Zealand and then backed it up on Sunday with 97-84 victory over a Sydney Kings team coming off a win on Friday night in Townsville over the Crocs.
Meanwhile, the Breakers were coming off four straight losses since beating Wollongong in Round 1 and the Hawks were returning home from a horror 40-point defeat in Perth on Friday night, but it was New Zealand who got the win 97-89 at the WIN Entertainment Centre.
The 36ers have now improved to a 4-2 record on the season to be clear in second position on the NBL ladder behind the 6-0 Perth Wildcats, but well ahead of the 2-2 Melbourne Tigers and Cairns Taipans.
The Sydney Kings are outside the top-four at 2-3 followed by the 2-4 New Zealand Breakers, 1-3 Townsville Crocs and 1-4 Wollongong Hawks.
Adelaide and Sydney played out a tight contest at the Adelaide Arena for three quarters on Sunday with the 36ers leading by nine points at half-time but the Kings closed that to just four at three quarter-time.
However, the Sixers nailed 31 points to 22 in the final period to run 97-84 winners.
Big man Daniel Johnson top-scored for Adelaide with 20 points, eight rebounds and three steals.
Import point guard Gary Ervin finished with 19 points, seven rebounds, seven assists and four steals despite shooting just 6-of-20 from the field.
Mitch Creek added 14 points, 10 boards and two blocked shots for the 36ers with Anthony Petrie adding 12 points and seven boards, Luke Schenscher 10 points and seven rebounds and Adam Gibson nine points and five assists.
Charles Carmouche backed up his 33-point night on Friday in Sydney's win over Townsville with another 27 points for the Kings against the 36ers.
Centre AJ Ogilvy had another good night with 22 points, 13 rebounds and three blocks with Ben Madgen adding 16 points but shooting just 7-of-19 from the field and 2-of-8 from down town.
Meanwhile in Wollongong, both the Hawks and Breakers were desperate to get their respective second wins of the 2013/14 NBL season, and it was a tight affair for most of the afternoon.
The Breakers had opened up a five-point gap by quarter-time, but the Hawks wouldn’t go away, largely thanks to import guard Rotnei Clarke, and closed the gap to four by half-time and one by three quarter-time.
However, the depth and experience of New Zealand having won the last three NBL championships showed in the last period, as did the Hawks' loss of centre Larry Davidson to a leg injury, as the Breakers ended up running out 97-89 winners after having lost their last four games.
Alex Pledger made the most of the Hawks losing Davidson before half-time with New Zealand's centre finishing with 19 points and seven rebounds. Mika Vukona, who was ejected in Thursday's loss at home to Adelaide, made up for that with 18 points and 11 boards for the Breakers.
Daryl Corletto added 15 points while nailing all three of his three-point attempts with Kerron Johnson adding 10 points and six assists, and Tom Abercrombie 10 points.
Clarke was outstanding for the Hawks scoring 36 points on the back of shooting 13-of-23 from the field and 5-of-11 from the field.
His 36 points are a season high in the NBL over taking Melbourne's Chris Goulding's 34 points on Saturday night after that overtook Carmouche's 33 points for Sydney on Friday.
Clarke's fellow Wollongong import Kevin Tiggs, who had a disastrous night in Perth on Friday with embarrassing missed dunks and terrible turnovers, had a much better time back home with 18 points, three boards and three assists.
Tim Coenraad also scored 12 points to go with nine boards and five assists for the Hawks.
Round 5 of the NBL will see three games played on Friday night with the Sydney Kings hosting the Cairns Taipans, the Adelaide 36ers taking on the Melbourne Tigers and the Townsville Crocs hosting the New Zealand Breakers.
Then on Sunday afternoon, the Melbourne Tigers take on the Wollongong Hawks at The Cage.