In addition to Magnus Carlsen drawing IM Nino Batsiashvili, there were many other huge upsets. Below are just some of the GMs who went down in round 1 against much lower rated players:
GM Wei Yi, Vitiugov, Khismatullin, Tregubov, and Dzagnidze, etc.
http://chess-results.com/tnr199261.aspx
Round 2 top board pairings
Bo. | No. | Name | Rtg | Pts. | Result | Pts. | Name | Rtg | No. | ||||
1 | 2 | GM | Kramnik Vladimir | 2796 | 1 | 1 | GM | Piorun Kacper | 2637 | 39 | |||
2 | 40 | GM | Grandelius Nils | 2632 | 1 | 1 | GM | Giri Anish | 2784 | 3 | |||
3 | 4 | GM | So Wesley | 2775 | 1 | 1 | GM | Naroditsky Daniel | 2628 | 41 | |||
4 | 43 | GM | Salem A.R. Saleh | 2622 | 1 | 1 | GM | Karjakin Sergey | 2766 | 5 | |||
5 | 6 | GM | Li Chao B | 2750 | 1 | 1 | GM | Ipatov Alexander | 2619 | 45 | |||
6 | 46 | GM | Zhang Zhong | 2619 | 1 | 1 | GM | Mamedyarov Shakhriyar | 2748 | 7 | |||
7 | 8 | GM | Tomashevsky Evgeny | 2744 | 1 | 1 | GM | Bluebaum Matthias | 2590 | 51 | |||
8 | 50 | GM | Bok Benjamin | 2594 | 1 | 1 | GM | Yu Yangyi | 2736 | 11 | |||
9 | 14 | GM | Wojtaszek Radoslaw | 2723 | 1 | 1 | IM | Lin Chen | 2532 | 57 | |||
10 | 54 | GM | Rambaldi Francesco | 2560 | 1 | 1 | GM | Korobov Anton | 2713 | 15 | |||
11 | 56 | GM | Kosteniuk Alexandra | 2542 | 1 | 1 | GM | Ponomariov Ruslan | 2710 | 17 | |||
12 | 20 | GM | Howell David W L | 2688 | 1 | 1 | GM | Stefanova Antoaneta | 2521 | 61 | |||
13 | 62 | GM | Al-Sayed Mohammed | 2520 | 1 | 1 | GM | Matlakov Maxim | 2684 | 21 | |||
14 | 22 | GM | Hou Yifan | 2683 | 1 | 1 | GM | Harika Dronavalli | 2513 | 63 | |||
15 | 64 | GM | Sundararajan Kidambi | 2513 | 1 | 1 | GM | Duda Jan-Krzysztof | 2663 | 25 | |||
16 | 26 | GM | Dubov Daniil | 2655 | 1 | 1 | IM | Gagare Shardul | 2470 | 78 | |||
17 | 66 | IM | Yuffa Daniil | 2504 | 1 | 1 | GM | Bologan Viktor | 2654 | 27 | |||
18 | 30 | GM | Ganguly Surya Shekhar | 2648 | 1 | 1 | Fang Yuxiang | 2438 | 94 | ||||
19 | 79 | Xu Yinglun | 2470 | 1 | 1 | GM | Sjugirov Sanan | 2646 | 33 | ||||
20 | 34 | GM | Swiercz Dariusz | 2646 | 1 | 1 | Firouzja Alireza | 2372 | 118 | ||||
21 | 121 | IM | Tissir Mohamed | 2346 | 1 | 1 | GM | Vidit Santosh Gujrathi | 2644 | 35 | |||
22 | 124 | Raja Harshit | 2325 | 1 | 1 | GM | Sethuraman S.P. | 2639 | 37 | ||||
23 | 75 | GM | Aravindh Chithambaram Vr. | 2486 | ½ | ½ | GM | Carlsen Magnus | 2834 | 1 | |||
24 | 67 | IM | Batsiashvili Nino | 2498 | ½ | ½ | GM | Harikrishna P. | 2743 | 9 | |||
25 | 10 | GM | Jakovenko Dmitry | 2737 | ½ | ½ | IM | Ma Zhonghan | 2463 | 82 | |||
26 | 16 | GM | Ivanchuk Vassily | 2710 | ½ | ½ | IM | Tabatabaei M.Amin | 2482 | 76 | |||
27 | 18 | GM | Ni Hua | 2693 | ½ | ½ | IM | Sagar Shah | 2441 | 90 | |||
28 | 89 | IM | Puranik Abhimanyu | 2442 | ½ | ½ | GM | Moiseenko Alexander | 2689 | 19 | |||
29 | 85 | IM | Lorparizangeneh Shahin | 2454 | ½ | ½ | GM | Adhiban B. | 2669 | 23 | |||
30 | 24 | GM | Fedoseev Vladimir | 2664 | ½ | ½ | IM | Ali Marandi Cemil Can | 2454 | 84 | |||
31 | 97 | GM | Carlsson Pontus | 2433 | ½ | ½ | GM | Akopian Vladimir | 2648 | 29 | |||
32 | 95 | IM | Padmini Rout | 2437 | ½ | ½ | GM | Khairullin Ildar | 2647 | 31 | |||
33 | 32 | GM | Shankland Samuel L | 2646 | ½ | ½ | IM | Vignesh N R | 2422 | 102 | |||
34 | 36 | GM | Nguyen Ngoc Truong Son | 2642 | ½ | ½ | FM | Abdusattorov Nodirbek | 2429 | 98 | |||
35 | 38 | GM | Sasikiran Krishnan | 2638 | ½ | ½ | IM | Saiyn Zhanat | 2394 | 108 | |||
36 | 42 | GM | Lenderman Aleksandr | 2626 | ½ | ½ | FM | Haria Ravi | 2416 | 104 | |||
37 | 44 | GM | Bartel Mateusz | 2620 | ½ | ½ | IM | Khademalsharieh Sarasadat | 2380 | 114 | |||
38 | 115 | IM | Karavade Eesha | 2379 | ½ | ½ | GM | Lu Shanglei | 2618 | 47 | |||
39 | 48 | GM | Hamdouchi Hicham | 2597 | ½ | ½ | IM | Pham Le Thao Nguyen | 2319 | 126 | |||
40 | 113 | IM | Christiansen Johan-Sebastian | 2385 | ½ | ½ | GM | Vocaturo Daniele | 2597 | 49 | |||
41 | 125 | WGM | Pourkashiyan Atousa | 2322 | ½ | ½ | GM | Esen Baris | 2562 | 53 | |||
42 | 131 | WGM | Bartel Marta | 2271 | ½ | ½ | GM | Xu Jun | 2526 | 59 | |||
43 | 60 | GM | Bromberger Stefan | 2521 | ½ | ½ | WGM | Abdumalik Zhansaya | 2390 | 110 | |||
44 | 119 | Roy Prantik | 2370 | ½ | ½ | GM | Schroeder Jan-Christian | 2511 | 65 | ||||
45 | 12 | GM | Wei Yi | 2730 | 0 | 0 | FM | Basso Pier Luigi | 2438 | 93 | |||
46 | 99 | FM | Rohan Ahuja | 2426 | 0 | 0 | GM | Vitiugov Nikita | 2724 | 13 | |||
47 | 28 | GM | Khismatullin Denis | 2654 | 0 | 0 | IM | Aryan Chopra | 2436 | 96 | |||
48 | 52 | GM | Tregubov Pavel V. | 2589 | 0 | 0 | IM | Nezad Husein Aziz | 2425 | 100 | |||
49 | 101 | IM | Seyb Alexander | 2425 | 0 | 0 | GM | Dzagnidze Nana | 2559 | 55 | |||
50 | 58 | IM | Svane Rasmus | 2529 | 0 | 0 | FM | Gholami Aryan | 2422 | 103 |