She was a worthy No. 1 in an era of uncertainty , and remains a figure who should never go underestimated .
As competitors go , Jankovic 's mental prowess and sense of humor sets her apart in the face of adversity .
Jankovic was a worthy No. 1 in an era of uncertainty , and remains a figure who should never go underestimated .
As competitors go , Jankovic 's mental prowess and sense of humor sets her apart in the face of adversity .