Niemeyer qualified for the main draw in singles at the
Waikoloa Challenger in late January, losing 4–6, 2–6 to
André Sá in the first round. He played Davis Cup the following week and won a dead rubber over
Adrián García of
Chile. In late February he played both singles and doubles at
Cherbourg Challenger, losing in the first round in singles and the second in doubles, partnering
Ota Fukárek. The following week he lost in qualifying, in the first round as the No. 3 seed, at the
Besançon Challenger in France and repeated that fate the next week at the Sparkessen Magdeburg Open. In late March he lost in singles in the first round of U.S.A. F7, as the No. 4 seed, but the following week, at U.S.A. F8, reached the second round, as the top seed, while winning doubles, partnering again Doyle. The next week at U.S.A. F9, Niemeyer reached the finals of the singles, as the No. 3 seed, losing to
Damián Furmanski 2–6, 7–5, 4–6. In doubles he reached the second round, with Keith Brill. Niemeyer lost in first round qualifying action in singles for the
U.S. Men's Clay Court Championships at the beginning of May. He next played the inaugural
Fergana Challenger, losing in the second round to eventual champion
Vladimir Voltchkov, the No. 7 seed. He lost in the second round too in doubles, partnering
Stefano Galvani. The following week Niemeyer reached the second round in singles at the 16th Eisenberg Jerusalem Open, and the lost in the first round in doubles (with
Sébastien de Chaunac). Niemeyer attempted to qualify for the
French Open for the first time but lost soundly in the first round, to No. 9 seed
Gastón Etlis 6–1, 6–3. In June, he bypassed the grass-court season in Europe and played instead at a couple of American challenger events. Playing just singles, he reached the quarters in
Tallahassee and lost in the first round at the USTA Tennis Championships of Denver. He did attempt to qualify for Wimbledon but lost in the first round of qualifying to
Martin Lee. In July at Granby, Niemeyer reached the finals in doubles, partnering Turek as an unseeded team, while he lost in the first round in singles as a wild card entrant, to Mark Knowles. Two weeks later in Winnetka, he again lost in singles in the first round, as the No. 8 seed, while reaching the quarters in doubles, again with Jerry Turek. Niemeyer took the opening set off
Max Mirnyi but lost for the fourth straight time in the first round of the
Canadian Open. He and Turek also bowed out in the opening round in doubles as wild card entrants. Niemeyer and Turek fared better the following week in
Binghamton, reaching the semi-final round after having qualified. In singles, Niemeyer again failed to win a match, this time losing World No. 257
Rodolphe Cadart. Niemeyer again attempted to qualify for the Legg Mason in Washington, D.C. and the Hamlet Cup in on Long Island but lost in the first round on both occasions. He lost in the second round of qualifying for the U.S. Open in singles, to No. 11 seed
Takao Suzuki. Dropping down to Futures level for his next tournament in early September, Niemeyer reached the semi-finals, as the No. 2 seed, of France F17. He and partner
Rik de Voest won the doubles tournament. The following week at France F18, the unseeded Niemeyer lost his only singles match and reached the second round in doubles, playing alongside
Yves Allegro. In October, Niemeyer played another Challenger event, the St. Francis Health System USTA Challenger, in
Tulsa, and again lost his opening round match. In doubles, playing with
Cedric Kauffmann, he reached the second round. The following week Niemeyer played U.S.A. F23 in
Waco, reaching the semis in both singles and doubles. Two weeks later in
Yokohama he again played doubles with Frenchman Kaufmann, and the tandem reached the semi-finals. The following week in
Seoul, Niemeyer and Kaufmann reached the quarters. Meanwhile, in singles, Niemeyer lost both times in the Far East in the first round of the main draw. He failed to qualify for the main draw of the Osaka International Tennis Tournament, despite being the No. 2 seed. Niemeyer finally won a Challenger event singles match when he defeated
Glenn Weiner in the first round in
Knoxville. He lost to World No. 136
Xavier Malisse in the next round. In doubles, he and Jerry Turek lost their opening match. This concluded a disappointing 2000 for Niemeyer in singles, who saw his ranking drop from World No. 229 on January 10 to World No. 354 on December 18. He had a successful year in doubles however, improving from a ranking of World No. 380 to No. 245 for the same dates, and claiming two titles, one runners-up, and three semi-finals appearances. ==2001==