The 34-year-old, who gave beginning to youngest daughter Cecilia final April, fought again from a set all the way down to win the all-German contest 4-6 6-2 7-5 in two hours and 17 minutes on Court docket One.
It meant Maria marched into her first main semi-final on her thirty fifth look in the primary draw of a grand slam to maintain defying the percentages in SW19.
Mom-of-two Tatjana Maria continued her outstanding run at Wimbledon by securing a maiden semi-final look on the All England Membership with victory over compatriot Jule Niemeier.
Niemeier, who beat Briton Heather Watson within the final spherical, arrived at Wimbledon with out a grand slam victory to her title and began this quarter-final tie properly.
A strong overhead volley helped safe a break in Maria’s opening service sport earlier than the 22-year-old rocked again to provide a beautiful forehand winner on her method to an essential maintain.
Whereas a 118mph ace noticed the extra skilled German participant get on the board, Niemeier continued to point out maturity past her years and claimed the opening set in 43 minutes.
The wide-ranging skillset of world quantity 97 Niemeier was on full show within the first sport of the second set the place one other break was secured.
A surprising drop shot and perfectly-placed lob put the teen on the verge of the break, which was secured with a backhand winner.
Maria had confronted loads of adversity on her run to the quarter-finals although, saving two match factors towards Jelena Ostapenko within the final 16, and got here combating again in trademark style.
It took her 57 minutes to create a primary break level and whereas that was saved, the following was taken with a volley on the internet on her knees.
With confidence flowing, Maria held with one other ace earlier than a double-fault by her opponent noticed a giant shift in momentum.
The early composure of Niemeier was now being examined and a decider was pressured after an excellent rally the place Maria’s good lob was replied with a tweener, however the world quantity 103 made a volley on the internet to take the second.
After the compatriots exchanged aces initially of the third, breaks had been then shared within the fifth and eight sport of the ultimate set.
Maria, who had fought again from 4-2 down, needed to save a break level throughout a prolonged eleventh sport the place Niemeier ended up sliding on the grass after failing to get to a different distinctive drop shot from her fellow German.
The maintain opened the door for Maria whose trademark slicing led to a different unforced error which secured her a memorable victory.